@Article{Chou:2016lxi,
  author        = {Chou, John Paul and Curtin, David and Lubatti, H. J.},
  journal       = {Phys. Lett.},
  title         = {{New Detectors to Explore the Lifetime Frontier}},
  year          = {2017},
  pages         = {29-36},
  volume        = {B767},
  archiveprefix = {arXiv},
  doi           = {10.1016/j.physletb.2017.01.043},
  eprint        = {1606.06298},
  groups        = {Keep},
  primaryclass  = {hep-ph},
  slaccitation  = {%%CITATION = ARXIV:1606.06298;%%},
}

@Article{Feng:2017uoz,
  author        = {Feng, Jonathan L. and Galon, Iftah and Kling, Felix and Trojanowski, Sebastian},
  journal       = {Phys. Rev.},
  title         = {{ForwArd Search ExpeRiment at the LHC}},
  year          = {2018},
  number        = {3},
  pages         = {035001},
  volume        = {D97},
  archiveprefix = {arXiv},
  doi           = {10.1103/PhysRevD.97.035001},
  eprint        = {1708.09389},
  groups        = {Keep},
  primaryclass  = {hep-ph},
  reportnumber  = {UCI-TR-2017-08},
  slaccitation  = {%%CITATION = ARXIV:1708.09389;%%},
}

@Article{Pascoli:2018heg,
  author        = {Pascoli, Silvia and Ruiz, Richard and Weiland, Cedric},
  journal       = {JHEP},
  title         = {{Heavy neutrinos with dynamic jet vetoes: multilepton searches at $\sqrt{s}=14$ , 27, and 100 TeV}},
  year          = {2019},
  pages         = {049},
  volume        = {06},
  archiveprefix = {arXiv},
  doi           = {10.1007/JHEP06(2019)049},
  eprint        = {1812.08750},
  groups        = {Keep},
  primaryclass  = {hep-ph},
  reportnumber  = {CP3-18-77, IPPP/18/111, PITT-PACC-1821, VBSCAN-PUB-10-18},
  slaccitation  = {%%CITATION = ARXIV:1812.08750;%%},
}

@Article{Drewes:2018gkc,
  author        = {Drewes, Marco and Hajer, Jan and Klaric, Juraj and Lanfranchi, Gaia},
  journal       = {JHEP},
  title         = {{NA62 sensitivity to heavy neutral leptons in the low scale seesaw model}},
  year          = {2018},
  pages         = {105},
  volume        = {07},
  archiveprefix = {arXiv},
  doi           = {10.1007/JHEP07(2018)105},
  eprint        = {1801.04207},
  groups        = {Keep},
  primaryclass  = {hep-ph},
  slaccitation  = {%%CITATION = ARXIV:1801.04207;%%},
}

@Article{Krasnov:2019kdc,
  author        = {Krasnov, Igor},
  journal       = {Phys. Rev. D},
  title         = {{DUNE prospects in the search for sterile neutrinos}},
  year          = {2019},
  number        = {7},
  pages         = {075023},
  volume        = {100},
  archiveprefix = {arXiv},
  doi           = {10.1103/PhysRevD.100.075023},
  eprint        = {1902.06099},
  groups        = {Keep},
  primaryclass  = {hep-ph},
}

@Article{Abdurashitov:2017kka,
  author        = {Abdurashitov, J. N. and others},
  journal       = {Pisma Zh. Eksp. Teor. Fiz.},
  title         = {{First measeurements in search for keV-sterile neutrino in tritium beta-decay by Troitsk nu-mass experiment}},
  year          = {2017},
  note          = {[JETP Lett.105,no.12,753(2017)]},
  number        = {12},
  pages         = {723-724},
  volume        = {105},
  archiveprefix = {arXiv},
  doi           = {10.1134/S0021364017120013},
  eprint        = {1703.10779},
  groups        = {Keep},
  primaryclass  = {hep-ex},
  slaccitation  = {%%CITATION = ARXIV:1703.10779;%%},
}

@Article{Derbin2018,
  author   = {Derbin, A. V. and Drachnev, I. S. and Lomskaya, I. S. and Muratova, V. N. and Pilipenko, N. V. and Semenov, D. A. and Tukkhonen, L. M. and Unzhakov, E. V. and Khusainov, A. Kh.},
  journal  = {JETP Letters},
  title    = {Search for a Neutrino with a Mass of 0.01--1.0 MeV in Beta Decays of 144Ce--144Pr Nuclei},
  year     = {2018},
  issn     = {1090-6487},
  month    = {Oct},
  number   = {8},
  pages    = {499--503},
  volume   = {108},
  abstract = {Spectra of electrons from beta decays of 144Ce--144Pr nuclei have been measured and analyzed in order to find a contribution from a heavy neutrino. For the neutrino with the mass m$\nu$H in the interval of 150--350 keV, a new upper bound |UeH|2 ≤ (2−5) {\texttimes} 10−3 at 90{\%} C.L. has been found for the mixing parameter.},
  day      = {01},
  doi      = {10.1134/S0021364018200067},
  groups   = {Keep},
  url      = {https://doi.org/10.1134/S0021364018200067},
}

@Article{Derbin:1993wy,
  author       = {Derbin, A. I. and Chernyi, A. V. and Popeko, L. A. and Muratova, V. N. and Shishkina, G. A. and Bakhlanov, S. I.},
  journal      = {JETP Lett.},
  title        = {{Experiment on anti-neutrino scattering by electrons at a reactor of the Rovno nuclear power plant}},
  year         = {1993},
  note         = {[Pisma Zh. Eksp. Teor. Fiz.57,755(1993)]},
  pages        = {768-772},
  volume       = {57},
  groups       = {Keep},
  slaccitation = {%%CITATION = JTPLA,57,768;%%},
}

@Article{Atre:2009rg,
  author        = {Atre, Anupama and Han, Tao and Pascoli, Silvia and Zhang, Bin},
  journal       = {JHEP},
  title         = {{The Search for Heavy Majorana Neutrinos}},
  year          = {2009},
  pages         = {030},
  volume        = {0905},
  archiveprefix = {arXiv},
  doi           = {10.1088/1126-6708/2009/05/030},
  eprint        = {0901.3589},
  groups        = {Keep},
  primaryclass  = {hep-ph},
}

@Article{Aad:2015xaa,
  author        = {Aad, Georges and others},
  journal       = {JHEP},
  title         = {{Search for heavy Majorana neutrinos with the ATLAS detector in pp collisions at $ \sqrt{s}=8 $ TeV}},
  year          = {2015},
  pages         = {162},
  volume        = {07},
  archiveprefix = {arXiv},
  collaboration = {ATLAS},
  doi           = {10.1007/JHEP07(2015)162},
  eprint        = {1506.06020},
  groups        = {Keep},
  primaryclass  = {hep-ex},
  reportnumber  = {CERN-PH-EP-2015-070},
  slaccitation  = {%%CITATION = ARXIV:1506.06020;%%},
}

@Article{Mastrototaro:2019vug,
  author        = {Mastrototaro, Leonardo and Mirizzi, Alessandro and Serpico, Pasquale Dario and Esmaili, Arman},
  journal       = {JCAP},
  title         = {{Heavy sterile neutrino emission in core-collapse supernovae: Constraints and signatures}},
  year          = {2020},
  pages         = {010},
  volume        = {01},
  archiveprefix = {arXiv},
  doi           = {10.1088/1475-7516/2020/01/010},
  eprint        = {1910.10249},
  groups        = {Keep},
  primaryclass  = {hep-ph},
}

@Article{Antusch:2017hhu,
  author        = {Antusch, Stefan and Cazzato, Eros and Fischer, Oliver},
  journal       = {Phys. Lett. B},
  title         = {{Sterile neutrino searches via displaced vertices at LHCb}},
  year          = {2017},
  pages         = {114--118},
  volume        = {774},
  archiveprefix = {arXiv},
  doi           = {10.1016/j.physletb.2017.09.057},
  eprint        = {1706.05990},
  groups        = {Keep},
  primaryclass  = {hep-ph},
}

@Article{Drewes:2019fou,
  author        = {Drewes, Marco and Hajer, Jan},
  journal       = {JHEP},
  title         = {{Heavy Neutrinos in displaced vertex searches at the LHC and HL-LHC}},
  year          = {2020},
  pages         = {070},
  volume        = {02},
  archiveprefix = {arXiv},
  doi           = {10.1007/JHEP02(2020)070},
  eprint        = {1903.06100},
  groups        = {Keep},
  primaryclass  = {hep-ph},
  reportnumber  = {CP3-19-11},
}

@Article{Kovalenko:2009td,
  author        = {Kovalenko, Sergey and Lu, Zhun and Schmidt, Ivan},
  journal       = {Phys.Rev.},
  title         = {{Lepton Number Violating Processes Mediated by Majorana Neutrinos at Hadron Colliders}},
  year          = {2009},
  pages         = {073014},
  volume        = {D80},
  archiveprefix = {arXiv},
  doi           = {10.1103/PhysRevD.80.073014},
  eprint        = {0907.2533},
  groups        = {Keep},
  primaryclass  = {hep-ph},
}

@Article{Roach:2019ctw,
  author        = {Roach, Brandon M. and Ng, Kenny C.Y. and Perez, Kerstin and Beacom, John F. and Horiuchi, Shunsaku and Krivonos, Roman and Wik, Daniel R.},
  journal       = {Phys. Rev. D},
  title         = {{NuSTAR Tests of Sterile-Neutrino Dark Matter: New Galactic Bulge Observations and Combined Impact}},
  year          = {2020},
  number        = {10},
  pages         = {103011},
  volume        = {101},
  archiveprefix = {arXiv},
  doi           = {10.1103/PhysRevD.101.103011},
  eprint        = {1908.09037},
  groups        = {Keep},
  primaryclass  = {astro-ph.HE},
}

@Article{Ng:2019gch,
  author        = {Ng, Kenny C. Y. and Roach, Brandon M. and Perez, Kerstin and Beacom, John F. and Horiuchi, Shunsaku and Krivonos, Roman and Wik, Daniel R.},
  journal       = {Phys. Rev.},
  title         = {{New Constraints on Sterile Neutrino Dark Matter from $NuSTAR$ M31 Observations}},
  year          = {2019},
  pages         = {083005},
  volume        = {D99},
  archiveprefix = {arXiv},
  doi           = {10.1103/PhysRevD.99.083005},
  eprint        = {1901.01262},
  groups        = {Keep},
  primaryclass  = {astro-ph.HE},
  slaccitation  = {%%CITATION = ARXIV:1901.01262;%%},
}

@Article{Neronov:2015kca,
  author        = {Neronov, A. and Malyshev, D.},
  journal       = {Phys. Rev.},
  title         = {{Toward a full test of the $\nu$MSM sterile neutrino dark matter model with Athena}},
  year          = {2016},
  number        = {6},
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  volume        = {D93},
  archiveprefix = {arXiv},
  doi           = {10.1103/PhysRevD.93.063518},
  eprint        = {1509.02758},
  groups        = {Keep},
  primaryclass  = {astro-ph.HE},
  slaccitation  = {%%CITATION = ARXIV:1509.02758;%%},
}

@Article{Boyarsky:2009ix,
  author        = {Boyarsky, Alexey and Ruchayskiy, Oleg and Shaposhnikov, Mikhail},
  journal       = {Ann. Rev. Nucl. Part. Sci.},
  title         = {{The Role of sterile neutrinos in cosmology and astrophysics}},
  year          = {2009},
  pages         = {191--214},
  volume        = {59},
  archiveprefix = {arXiv},
  doi           = {10.1146/annurev.nucl.010909.083654},
  eprint        = {0901.0011},
  groups        = {Keep},
  primaryclass  = {hep-ph},
}

@Article{Ruchayskiy:2012si,
  author        = {Ruchayskiy, Oleg and Ivashko, Artem},
  journal       = {JCAP},
  title         = {{Restrictions on the lifetime of sterile neutrinos from primordial nucleosynthesis}},
  year          = {2012},
  pages         = {014},
  volume        = {1210},
  archiveprefix = {arXiv},
  doi           = {10.1088/1475-7516/2012/10/014},
  eprint        = {1202.2841},
  groups        = {Keep},
  primaryclass  = {hep-ph},
  reportnumber  = {CERN-PH-TH-2012-042},
  slaccitation  = {%%CITATION = ARXIV:1202.2841;%%},
}

@Article{Artamonov:2014urb,
  author        = {Artamonov, A.V. and others},
  journal       = {Phys.Rev.},
  title         = {{Search for heavy neutrinos in $K^+\to\mu^+\nu_H$ decays}},
  year          = {2015},
  number        = {5},
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  volume        = {D91},
  archiveprefix = {arXiv},
  collaboration = {E949},
  doi           = {10.1103/PhysRevD.91.059903, 10.1103/PhysRevD.91.052001},
  eprint        = {1411.3963},
  groups        = {Keep},
  primaryclass  = {hep-ex},
  slaccitation  = {%%CITATION = ARXIV:1411.3963;%%},
}

@Article{CooperSarkar:1985nh,
  author        = {Cooper-Sarkar, Amanda M. and others},
  journal       = {Phys.Lett.},
  title         = {{Search for Heavy Neutrino Decays in the {BEBC} Beam Dump Experiment}},
  year          = {1985},
  pages         = {207},
  volume        = {B160},
  collaboration = {WA66 Collaboration},
  doi           = {10.1016/0370-2693(85)91493-5},
  groups        = {Keep},
  reportnumber  = {CERN-EP-85-104},
  slaccitation  = {%%CITATION = PHLTA,B160,207;%%},
}

@Article{Gallas:1994xp,
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  journal       = {Phys.Rev.},
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  volume        = {D52},
  collaboration = {FMMF Collaboration},
  doi           = {10.1103/PhysRevD.52.6},
  groups        = {Keep},
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}

@Article{delAguila:2008pw,
  author        = {del Aguila, F. and de Blas, J. and Perez-Victoria, M.},
  journal       = {Phys.Rev.},
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  year          = {2008},
  pages         = {013010},
  volume        = {D78},
  archiveprefix = {arXiv},
  doi           = {10.1103/PhysRevD.78.013010},
  eprint        = {0803.4008},
  groups        = {Keep},
  primaryclass  = {hep-ph},
  reportnumber  = {UG-FT-224-08, CAFPE-94-08},
  slaccitation  = {%%CITATION = ARXIV:0803.4008;%%},
}

@Article{Yamazaki:1984sj,
  author       = {Yamazaki, T. and Ishikawa, T. and Akiba, Y. and Iwasaki, M. and Tanaka, K.H. and others},
  journal      = {Conf.Proc.},
  title        = {{Search for Heavy Neutrinos in Kaon Decay}},
  year         = {1984},
  pages        = {I.262},
  volume       = {C840719},
  groups       = {Keep},
  slaccitation = {%%CITATION = INSPIRE-211342;%%},
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@Article{Vaitaitis:1999wq,
  author        = {Vaitaitis, A. and others},
  journal       = {Phys.Rev.Lett.},
  title         = {{Search for neutral heavy leptons in a high-energy neutrino beam}},
  year          = {1999},
  pages         = {4943-4946},
  volume        = {83},
  archiveprefix = {arXiv},
  collaboration = {NuTeV Collaboration, E815 Collaboration},
  doi           = {10.1103/PhysRevLett.83.4943},
  eprint        = {hep-ex/9908011},
  groups        = {Keep},
  primaryclass  = {hep-ex},
  reportnumber  = {FERMILAB-PUB-99-223-E},
  slaccitation  = {%%CITATION = HEP-EX/9908011;%%},
}

@Article{Aaij:2014aba,
  author        = {Aaij, Roel and others},
  journal       = {Phys.Rev.Lett.},
  title         = {{Search for Majorana neutrinos in $B^- \to \pi^+\mu^-\mu^-$ decays}},
  year          = {2014},
  number        = {13},
  pages         = {131802},
  volume        = {112},
  archiveprefix = {arXiv},
  collaboration = {LHCb collaboration},
  doi           = {10.1103/PhysRevLett.112.131802},
  eprint        = {1401.5361},
  groups        = {Keep},
  primaryclass  = {hep-ex},
  reportnumber  = {CERN-PH-EP-2014-002, LHCB-PAPER-2013-064},
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@Article{Astier:2001ck,
  author        = {Astier, P. and others},
  journal       = {Phys.Lett.},
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  year          = {2001},
  pages         = {27-38},
  volume        = {B506},
  archiveprefix = {arXiv},
  collaboration = {NOMAD Collaboration},
  doi           = {10.1016/S0370-2693(01)00362-8},
  eprint        = {hep-ex/0101041},
  groups        = {Keep},
  primaryclass  = {hep-ex},
  reportnumber  = {CERN-EP-2001-005},
  slaccitation  = {%%CITATION = HEP-EX/0101041;%%},
}

@Article{Daum:1987bg,
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  journal      = {Phys.Rev.},
  title        = {{Search for Admixtures of Massive Neutrinos in the Decay $\pi^+ \to \mu^+$ Neutrino}},
  year         = {1987},
  pages        = {2624},
  volume       = {D36},
  doi          = {10.1103/PhysRevD.36.2624},
  groups       = {Keep},
  reportnumber = {SIN-PR-87-04},
  slaccitation = {%%CITATION = PHRVA,D36,2624;%%},
}

@Article{Hayano:1982wu,
  author       = {Hayano, R.S. and Taniguchi, T. and Yamanaka, T. and Tanimori, T. and Enomoto, R. and others},
  journal      = {Phys.Rev.Lett.},
  title        = {{HEAVY NEUTRINO SEARCH USING K(mu2) DECAY}},
  year         = {1982},
  pages        = {1305},
  volume       = {49},
  doi          = {10.1103/PhysRevLett.49.1305},
  groups       = {Keep},
  reportnumber = {KEK-Preprint-82-21},
  slaccitation = {%%CITATION = PRLTA,49,1305;%%},
}

@Article{Antusch:2014woa,
  author        = {Antusch, S. and Fischer, O.},
  journal       = {JHEP},
  title         = {{Non-unitarity of the leptonic mixing matrix: Present bounds and future sensitivities}},
  year          = {2014},
  pages         = {94},
  volume        = {1410},
  archiveprefix = {arXiv},
  doi           = {10.1007/JHEP10(2014)094},
  eprint        = {1407.6607},
  groups        = {Keep},
  primaryclass  = {hep-ph},
  reportnumber  = {MPP-2014-313},
  slaccitation  = {%%CITATION = ARXIV:1407.6607;%%},
}

@Article{An:2016luf,
  author        = {An, Feng Peng and others},
  journal       = {Phys. Rev. Lett.},
  title         = {{Improved Search for a Light Sterile Neutrino with the Full Configuration of the Daya Bay Experiment}},
  year          = {2016},
  number        = {15},
  pages         = {151802},
  volume        = {117},
  archiveprefix = {arXiv},
  collaboration = {Daya Bay},
  doi           = {10.1103/PhysRevLett.117.151802},
  eprint        = {1607.01174},
  groups        = {Keep},
  primaryclass  = {hep-ex},
  slaccitation  = {%%CITATION = ARXIV:1607.01174;%%},
}

@Article{Ko:2016owz,
  author        = {Ko, Y. J. and others},
  journal       = {Phys. Rev. Lett.},
  title         = {{Sterile Neutrino Search at the NEOS Experiment}},
  year          = {2017},
  number        = {12},
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  volume        = {118},
  archiveprefix = {arXiv},
  collaboration = {NEOS},
  doi           = {10.1103/PhysRevLett.118.121802},
  eprint        = {1610.05134},
  groups        = {Keep},
  primaryclass  = {hep-ex},
  slaccitation  = {%%CITATION = ARXIV:1610.05134;%%},
}
  

]

@Article{Alekseev:2018efk,
  author        = {Alekseev, I and others},
  journal       = {Phys. Lett.},
  title         = {{Search for sterile neutrinos at the DANSS experiment}},
  year          = {2018},
  pages         = {56-63},
  volume        = {B787},
  archiveprefix = {arXiv},
  collaboration = {DANSS},
  doi           = {10.1016/j.physletb.2018.10.038},
  eprint        = {1804.04046},
  groups        = {Keep},
  primaryclass  = {hep-ex},
  slaccitation  = {%%CITATION = ARXIV:1804.04046;%%},
}

@Article{Dentler:2018sju,
  author        = {Dentler, Mona and Hernandez-Cabezudo, Alvaro and Kopp, Joachim and Machado, Pedro A. N. and Maltoni, Michele and Martinez-Soler, Ivan and Schwetz, Thomas},
  journal       = {JHEP},
  title         = {{Updated Global Analysis of Neutrino Oscillations in the Presence of eV-Scale Sterile Neutrinos}},
  year          = {2018},
  pages         = {010},
  volume        = {08},
  archiveprefix = {arXiv},
  doi           = {10.1007/JHEP08(2018)010},
  eprint        = {1803.10661},
  groups        = {Keep},
  primaryclass  = {hep-ph},
  reportnumber  = {MITP-18-023, IFT-UAM-CSIC-18-033, MITP/18-023, FERMILAB-PUB-18-086-T, IFT-UAM/CSIC-18-033},
  slaccitation  = {%%CITATION = ARXIV:1803.10661;%%},
}


% Kink searces in beta decay spectrum

@Article{PhysRevLett.86.1978,
  author    = {Galeazzi, M. and Fontanelli, F. and Gatti, F. and Vitale, S.},
  journal   = {Phys. Rev. Lett.},
  title     = {Limits on the Existence of Heavy Neutrinos in the Range 50--1000 eV from the Study of the ${}^{187}\mathrm{Re}$ Beta Decay},
  year      = {2001},
  month     = {Mar},
  pages     = {1978--1981},
  volume    = {86},
  doi       = {10.1103/PhysRevLett.86.1978},
  groups    = {Keep},
  issue     = {10},
  numpages  = {0},
  publisher = {American Physical Society},
  url       = {https://link.aps.org/doi/10.1103/PhysRevLett.86.1978},
}

@Article{Hiddemann:1995ce,
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  title        = {{Limits on neutrino masses from the tritium beta spectrum}},
  year         = {1995},
  pages        = {639-650},
  volume       = {G21},
  doi          = {10.1088/0954-3899/21/5/008},
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}

@Article{Belesev:2013cba,
  author        = {Belesev, A. I. and Berlev, A. I. and Geraskin, E. V. and Golubev, A. A. and Likhovid, N. A. and Nozik, A. A. and Pantuev, V. S. and Parfenov, V. I. and Skasyrskaya, A. K.},
  journal       = {J. Phys.},
  title         = {{The search for an additional neutrino mass eigenstate in the 2–100 eV region from ‘Troitsk nu-mass’ data: a detailed analysis}},
  year          = {2014},
  pages         = {015001},
  volume        = {G41},
  archiveprefix = {arXiv},
  doi           = {10.1088/0954-3899/41/1/015001},
  eprint        = {1307.5687},
  groups        = {Keep},
  primaryclass  = {hep-ex},
  slaccitation  = {%%CITATION = ARXIV:1307.5687;%%},
}

@Article{Kraus:2012he,
  author        = {Kraus, Christine and Singer, Andrej and Valerius, Kathrin and Weinheimer, Christian},
  journal       = {Eur. Phys. J.},
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  year          = {2013},
  number        = {2},
  pages         = {2323},
  volume        = {C73},
  archiveprefix = {arXiv},
  doi           = {10.1140/epjc/s10052-013-2323-z},
  eprint        = {1210.4194},
  groups        = {Keep},
  primaryclass  = {hep-ex},
  slaccitation  = {%%CITATION = ARXIV:1210.4194;%%},
}

@Article{Holzschuh:1999vy,
  author       = {Holzschuh, E. and Kundig, W. and Palermo, L. and Stussi, H. and Wenk, P.},
  journal      = {Phys. Lett.},
  title        = {{Search for heavy neutrinos in the beta spectrum of Ni-63}},
  year         = {1999},
  pages        = {247-255},
  volume       = {B451},
  doi          = {10.1016/S0370-2693(99)00200-2},
  groups       = {Keep},
  slaccitation = {%%CITATION = PHLTA,B451,247;%%},
}

@Article{Holzschuh:2000nj,
  author       = {Holzschuh, E. and Palermo, L. and Stussi, H. and Wenk, P.},
  journal      = {Phys. Lett.},
  title        = {{The beta-spectrum of S-35 and search for the admixture of heavy neutrinos}},
  year         = {2000},
  pages        = {1-9},
  volume       = {B482},
  doi          = {10.1016/S0370-2693(00)00476-7},
  groups       = {Keep},
  slaccitation = {%%CITATION = PHLTA,B482,1;%%},
}

@Article{Schreckenbach:1983cg,
  author       = {Schreckenbach, K. and Colvin, G. and Von Feilitzsch, F.},
  journal      = {Phys. Lett.},
  title        = {{SEARCH FOR MIXING OF HEAVY NEUTRINOS IN THE BETA+ AND BETA- SPECTRA OF THE CU-64 DECAY}},
  year         = {1983},
  pages        = {265-268},
  volume       = {129B},
  doi          = {10.1016/0370-2693(83)90858-4},
  groups       = {Keep},
  slaccitation = {%%CITATION = PHLTA,129B,265;%%},
}

@Article{Derbin:1997ut,
  author       = {Derbin, A. V. and Egorov, A. I. and Bakhlanov, S. V. and Muratova, V. N.},
  journal      = {JETP Lett.},
  title        = {{Measurement of the Ca-45 beta spectrum in search of deviations from the theoretical shape}},
  year         = {1997},
  note         = {[Pisma Zh. Eksp. Teor. Fiz.66,81(1997)]},
  pages        = {88-92},
  volume       = {66},
  doi          = {10.1134/1.567508},
  groups       = {Keep},
  slaccitation = {%%CITATION = JTPLA,66,88;%%},
}

@Article{PhysRevC.27.1175,
  author    = {Calaprice, F. P. and Millener, D. J.},
  journal   = {Phys. Rev. C},
  title     = {Heavy neutrinos and the beta spectra of $^{35}\mathrm{S}$, $^{18}\mathrm{F}$, and $^{19}\mathrm{Ne}$},
  year      = {1983},
  month     = {Mar},
  pages     = {1175--1181},
  volume    = {27},
  doi       = {10.1103/PhysRevC.27.1175},
  groups    = {Keep},
  issue     = {3},
  numpages  = {0},
  publisher = {American Physical Society},
  url       = {https://link.aps.org/doi/10.1103/PhysRevC.27.1175},
}

@Article{PhysRevD.52.1343,
  author    = {Hagner, C. and Altmann, M. and Feilitzsch, F. v. and Oberauer, L. and Declais, Y. and Kajfasz, E.},
  journal   = {Phys. Rev. D},
  title     = {Experimental search for the neutrino decay ${\ensuremath{\nu}}_{3}$\ensuremath{\rightarrow}${\ensuremath{\nu}}_{\mathit{j}}$+${\mathit{e}}^{+}$+${\mathit{e}}^{\mathrm{\ensuremath{-}}}$ and limits on neutrino mixing},
  year      = {1995},
  month     = {Aug},
  pages     = {1343--1352},
  volume    = {52},
  doi       = {10.1103/PhysRevD.52.1343},
  groups    = {Keep},
  issue     = {3},
  numpages  = {0},
  publisher = {American Physical Society},
  url       = {https://link.aps.org/doi/10.1103/PhysRevD.52.1343},
}

@Article{PhysRevD.88.072010,
  author        = {Bellini, G. and Benziger, J. and Bick, D. and Bonfini, G. and Bravo, D. and Buizza Avanzini, M. and Caccianiga, B. and Cadonati, L. and Calaprice, F. and Cavalcante, P. and Chavarria, A. and Chepurnov, A. and D'Angelo, D. and Davini, S. and Derbin, A. and Drachnev, I. and Empl, A. and Etenko, A. and Fomenko, K. and Franco, D. and Galbiati, C. and Gazzana, S. and Ghiano, C. and Giammarchi, M. and G\"oger-Neff, M. and Goretti, A. and Grandi, L. and Hagner, C. and Hungerford, E. and Ianni, Aldo and Ianni, Andrea and Kobychev, V. and Korablev, D. and Korga, G. and Kryn, D. and Laubenstein, M. and Lewke, T. and Litvinovich, E. and Loer, B. and Lombardi, F. and Lombardi, P. and Ludhova, L. and Lukyanchenko, G. and Machulin, I. and Manecki, S. and Maneschg, W. and Manuzio, G. and Meindl, Q. and Meroni, E. and Miramonti, L. and Misiaszek, M. and Mosteiro, P. and Muratova, V. and Oberauer, L. and Obolensky, M. and Ortica, F. and Otis, K. and Pallavicini, M. and Papp, L. and Perasso, L. and Perasso, S. and Pocar, A. and Ranucci, G. and Razeto, A. and Re, A. and Romani, A. and Rossi, N. and Saldanha, R. and Salvo, C. and Sch\"onert, S. and Simgen, H. and Skorokhvatov, M. and Smirnov, O. and Sotnikov, A. and Sukhotin, S. and Suvorov, Y. and Tartaglia, R. and Testera, G. and Vignaud, D. and Vogelaar, R. B. and von Feilitzsch, F. and Winter, J. and Wojcik, M. and Wright, A. and Wurm, M. and Xu, J. and Zaimidoroga, O. and Zavatarelli, S. and Zuzel, G.},
  journal       = {Phys. Rev. D},
  title         = {New limits on heavy sterile neutrino mixing in $^{8}\mathrm{B}$ decay obtained with the Borexino detector},
  year          = {2013},
  month         = {Oct},
  pages         = {072010},
  volume        = {88},
  collaboration = {Borexino Collaboration},
  doi           = {10.1103/PhysRevD.88.072010},
  groups        = {Keep},
  issue         = {7},
  numpages      = {7},
  publisher     = {American Physical Society},
  url           = {https://link.aps.org/doi/10.1103/PhysRevD.88.072010},
}

% Pi decays

@Article{Bryman:2019ssi,
  author        = {Bryman, D.A. and Shrock, R.},
  journal       = {Phys. Rev. D},
  title         = {{Improved Constraints on Sterile Neutrinos in the MeV to GeV Mass Range}},
  year          = {2019},
  number        = {5},
  pages         = {053006},
  volume        = {100},
  archiveprefix = {arXiv},
  doi           = {10.1103/PhysRevD.100.053006},
  eprint        = {1904.06787},
  groups        = {Keep},
  primaryclass  = {hep-ph},
  reportnumber  = {UBC-TRIUMF-Stony Brook preprint (YITP-SB-2019-2)},
}

@Article{Aguilar-Arevalo:2017vlf,
  author        = {Aguilar-Arevalo, A. and others},
  journal       = {Phys. Rev.},
  title         = {{Improved search for heavy neutrinos in the decay $\pi\rightarrow e\nu$}},
  year          = {2018},
  number        = {7},
  pages         = {072012},
  volume        = {D97},
  archiveprefix = {arXiv},
  collaboration = {PIENU},
  doi           = {10.1103/PhysRevD.97.072012},
  eprint        = {1712.03275},
  groups        = {Keep},
  primaryclass  = {hep-ex},
  slaccitation  = {%%CITATION = ARXIV:1712.03275;%%},
}

% LNV Meson Decays

@Article{Abada:2017jjx,
  author        = {Abada, Asmaa and De Romeri, Valentina and Lucente, Michele and Teixeira, Ana M. and Toma, Takashi},
  journal       = {JHEP},
  title         = {{Effective Majorana mass matrix from tau and pseudoscalar meson lepton number violating decays}},
  year          = {2018},
  pages         = {169},
  volume        = {02},
  archiveprefix = {arXiv},
  doi           = {10.1007/JHEP02(2018)169},
  eprint        = {1712.03984},
  groups        = {Keep},
  primaryclass  = {hep-ph},
  reportnumber  = {LPT-Orsay-17-76, TUM-HEP-1115-17, CP3-17-52},
  slaccitation  = {%%CITATION = ARXIV:1712.03984;%%},
}

% Medium Energy decay bounds

@Article{Badier:1986xz,
  author        = {Badier, J. and others},
  journal       = {Z. Phys.},
  title         = {{Mass and Lifetime Limits on New Longlived Particles in 300-{GeV}/$c \pi^-$ Interactions}},
  year          = {1986},
  pages         = {21},
  volume        = {C31},
  collaboration = {NA3},
  doi           = {10.1007/BF01559588},
  groups        = {Keep},
  reportnumber  = {CERN-EP-86-22},
  slaccitation  = {%%CITATION = ZEPYA,C31,21;%%},
}

@Article{Bernardi:1987ek,
  author       = {Bernardi, G. and others},
  journal      = {Phys. Lett.},
  title        = {{FURTHER LIMITS ON HEAVY NEUTRINO COUPLINGS}},
  year         = {1988},
  pages        = {332-334},
  volume       = {B203},
  doi          = {10.1016/0370-2693(88)90563-1},
  groups       = {Keep},
  reportnumber = {CERN-EP/87-234},
  slaccitation = {%%CITATION = PHLTA,B203,332;%%},
}

@Article{Bergsma:1985is,
  author        = {Bergsma, F. and others},
  journal       = {Phys. Lett.},
  title         = {{A Search for Decays of Heavy Neutrinos in the Mass Range 0.5-{GeV} to 2.8-{GeV}}},
  year          = {1986},
  pages         = {473-478},
  volume        = {166B},
  collaboration = {CHARM},
  doi           = {10.1016/0370-2693(86)91601-1},
  groups        = {Keep},
  reportnumber  = {CERN-EP-85-190},
  slaccitation  = {%%CITATION = PHLTA,166B,473;%%},
}

@Article{Vilain:1994vg,
  author        = {Vilain, P. and others},
  journal       = {Phys. Lett.},
  title         = {{Search for heavy isosinglet neutrinos}},
  year          = {1995},
  note          = {[Phys. Lett.B351,387(1995)]},
  pages         = {453-458},
  volume        = {B343},
  collaboration = {CHARM II},
  doi           = {10.1016/0370-2693(94)00440-I,
	10.1016/0370-2693(94)01422-9},
  groups        = {Keep},
  reportnumber  = {CERN-PPE-94-168},
  slaccitation  = {%%CITATION = PHLTA,B343,453;%%},
}

@Article{Orloff:2002de,
  author        = {Orloff, J. and Rozanov, Alexandre N. and Santoni, C.},
  journal       = {Phys. Lett.},
  title         = {{Limits on the mixing of tau neutrino to heavy neutrinos}},
  year          = {2002},
  pages         = {8-15},
  volume        = {B550},
  archiveprefix = {arXiv},
  doi           = {10.1016/S0370-2693(02)02769-7},
  eprint        = {hep-ph/0208075},
  groups        = {Keep},
  primaryclass  = {hep-ph},
  reportnumber  = {PCCF-RI-0205},
  slaccitation  = {%%CITATION = HEP-PH/0208075;%%},
}

@Article{Baranov:1992vq,
  author       = {Baranov, S. A. and others},
  journal      = {Phys. Lett.},
  title        = {{Search for heavy neutrinos at the IHEP-JINR neutrino detector}},
  year         = {1993},
  pages        = {336-340},
  volume       = {B302},
  doi          = {10.1016/0370-2693(93)90405-7},
  groups       = {Keep},
  reportnumber = {JINR-P1-92-494},
  slaccitation = {%%CITATION = PHLTA,B302,336;%%},
}

@Article{Liventsev:2013zz,
  author        = {Liventsev, D. and others},
  journal       = {Phys. Rev.},
  title         = {{Search for heavy neutrinos at Belle}},
  year          = {2013},
  note          = {[Erratum: Phys. Rev.D95,no.9,099903(2017)]},
  number        = {7},
  pages         = {071102},
  volume        = {D87},
  archiveprefix = {arXiv},
  collaboration = {Belle},
  doi           = {10.1103/PhysRevD.95.099903, 10.1103/PhysRevD.87.071102},
  eprint        = {1301.1105},
  groups        = {Keep},
  primaryclass  = {hep-ex},
  reportnumber  = {BELLE-PREPRINT-2012-28, KEK-PREPRINT-2012-32},
  slaccitation  = {%%CITATION = ARXIV:1301.1105;%%},
}

@Article{Abe:2019kgx,
  author        = {Abe, K. and others},
  journal       = {Phys. Rev. D},
  title         = {{Search for heavy neutrinos with the T2K near detector ND280}},
  year          = {2019},
  number        = {5},
  pages         = {052006},
  volume        = {100},
  archiveprefix = {arXiv},
  collaboration = {T2K},
  doi           = {10.1103/PhysRevD.100.052006},
  eprint        = {1902.07598},
  groups        = {Keep},
  primaryclass  = {hep-ex},
}

@Article{Ablikim:2019gvd,
  author        = {Ablikim, Medina and others},
  journal       = {Phys. Rev.},
  title         = {{Search for heavy Majorana neutrino in lepton number violating decays of $D\to K \pi e^+ e^+$}},
  year          = {2019},
  number        = {11},
  pages         = {112002},
  volume        = {D99},
  archiveprefix = {arXiv},
  collaboration = {BESIII},
  doi           = {10.1103/PhysRevD.99.112002},
  eprint        = {1902.02450},
  groups        = {Keep},
  primaryclass  = {hep-ex},
  slaccitation  = {%%CITATION = ARXIV:1902.02450;%%},
}

@Article{Adriani:1992pq,
  author        = {Adriani, O. and others},
  journal       = {Phys. Lett.},
  title         = {{Search for isosinglet neutral heavy leptons in Z0 decays}},
  year          = {1992},
  pages         = {371-382},
  volume        = {B295},
  collaboration = {L3},
  doi           = {10.1016/0370-2693(92)91579-X},
  groups        = {Keep},
  reportnumber  = {CERN-PPE-92-164},
  slaccitation  = {%%CITATION = PHLTA,B295,371;%%},
}

@Article{Abreu:1996pa,
  author        = {Abreu, P. and others},
  journal       = {Z. Phys.},
  title         = {{Search for neutral heavy leptons produced in Z decays}},
  year          = {1997},
  note          = {[Erratum: Z. Phys.C75,580(1997)]},
  pages         = {57-71},
  volume        = {C74},
  collaboration = {DELPHI},
  doi           = {10.1007/s002880050370},
  groups        = {Keep},
  reportnumber  = {CERN-PPE-96-195},
  slaccitation  = {%%CITATION = ZEPYA,C74,57;%%},
}

@Article{Sirunyan:2018xiv,
  author        = {Sirunyan, Albert M and others},
  journal       = {JHEP},
  title         = {{Search for heavy Majorana neutrinos in same-sign dilepton channels in proton-proton collisions at $ \sqrt{s}=13 $ TeV}},
  year          = {2019},
  pages         = {122},
  volume        = {01},
  archiveprefix = {arXiv},
  collaboration = {CMS},
  doi           = {10.1007/JHEP01(2019)122},
  eprint        = {1806.10905},
  groups        = {Keep},
  primaryclass  = {hep-ex},
  reportnumber  = {CMS-EXO-17-028, CERN-EP-2018-159},
  slaccitation  = {%%CITATION = ARXIV:1806.10905;%%},
}

@Article{Sirunyan:2018mtv,
  author        = {Sirunyan, Albert M and others},
  journal       = {Phys. Rev. Lett.},
  title         = {{Search for heavy neutral leptons in events with three charged leptons in proton-proton collisions at $\sqrt{s} =$ 13 TeV}},
  year          = {2018},
  number        = {22},
  pages         = {221801},
  volume        = {120},
  archiveprefix = {arXiv},
  collaboration = {CMS},
  doi           = {10.1103/PhysRevLett.120.221801},
  eprint        = {1802.02965},
  groups        = {Keep},
  primaryclass  = {hep-ex},
  reportnumber  = {CMS-EXO-17-012, CERN-EP-2018-006},
  slaccitation  = {%%CITATION = ARXIV:1802.02965;%%},
}

@Article{deBlas:2013gla,
  author        = {de Blas, J.},
  journal       = {EPJ Web Conf.},
  title         = {{Electroweak limits on physics beyond the Standard Model}},
  year          = {2013},
  pages         = {19008},
  volume        = {60},
  archiveprefix = {arXiv},
  booktitle     = {{Proceedings, 1st Large Hadron Collider Physics Conference (LHCP 2013): Barcelona, Spain, May 13-18, 2013}},
  doi           = {10.1051/epjconf/20136019008},
  eprint        = {1307.6173},
  groups        = {Keep},
  primaryclass  = {hep-ph},
  slaccitation  = {%%CITATION = ARXIV:1307.6173;%%},
}

% Cosmology

@Article{Cirelli:2004cz,
  author        = {Cirelli, Marco and Marandella, Guido and Strumia, Alessandro and Vissani, Francesco},
  journal       = {Nucl. Phys.},
  title         = {{Probing oscillations into sterile neutrinos with cosmology, astrophysics and experiments}},
  year          = {2005},
  pages         = {215-267},
  volume        = {B708},
  archiveprefix = {arXiv},
  doi           = {10.1016/j.nuclphysb.2004.11.056},
  eprint        = {hep-ph/0403158},
  groups        = {Keep},
  primaryclass  = {hep-ph},
  reportnumber  = {IFUP-TH-2004-2},
  slaccitation  = {%%CITATION = HEP-PH/0403158;%%},
}

@Article{Bridle:2016isd,
  author        = {Bridle, Sarah and Elvin-Poole, Jack and Evans, Justin and Fernandez, Susana and Guzowski, Pawel and Soldner-Rembold, Stefan},
  journal       = {Phys. Lett.},
  title         = {{A Combined View of Sterile-Neutrino Constraints from CMB and Neutrino Oscillation Measurements}},
  year          = {2017},
  pages         = {322-327},
  volume        = {B764},
  archiveprefix = {arXiv},
  doi           = {10.1016/j.physletb.2016.11.050},
  eprint        = {1607.00032},
  groups        = {Keep},
  primaryclass  = {astro-ph.CO},
  slaccitation  = {%%CITATION = ARXIV:1607.00032;%%},
}

@Article{Vincent:2014rja,
  author        = {Vincent, Aaron C. and Martinez, Enrique Fernandez and Hernández, Pilar and Lattanzi, Massimiliano and Mena, Olga},
  journal       = {JCAP},
  title         = {{Revisiting cosmological bounds on sterile neutrinos}},
  year          = {2015},
  number        = {04},
  pages         = {006},
  volume        = {1504},
  archiveprefix = {arXiv},
  doi           = {10.1088/1475-7516/2015/04/006},
  eprint        = {1408.1956},
  groups        = {Keep},
  primaryclass  = {astro-ph.CO},
  reportnumber  = {IFIC-14-53, FTUAM-14-32, IFT-UAM-CSIC-14-075},
  slaccitation  = {%%CITATION = ARXIV:1408.1956;%%},
}

% Future

@Article{Mertens:2018vuu,
  author        = {Mertens, Susanne and others},
  journal       = {J. Phys.},
  title         = {{A novel detector system for KATRIN to search for keV-scale sterile neutrinos}},
  year          = {2019},
  number        = {6},
  pages         = {065203},
  volume        = {G46},
  archiveprefix = {arXiv},
  collaboration = {KATRIN},
  doi           = {10.1088/1361-6471/ab12fe},
  eprint        = {1810.06711},
  groups        = {Keep},
  primaryclass  = {physics.ins-det},
  slaccitation  = {%%CITATION = ARXIV:1810.06711;%%},
}

@Article{Hernandez:2018cgc,
  author        = {Hernández, P. and Jones-Pérez, J. and Suarez-Navarro, O.},
  journal       = {Eur. Phys. J.},
  title         = {{Majorana vs Pseudo-Dirac Neutrinos at the ILC}},
  year          = {2019},
  number        = {3},
  pages         = {220},
  volume        = {C79},
  archiveprefix = {arXiv},
  doi           = {10.1140/epjc/s10052-019-6728-1},
  eprint        = {1810.07210},
  groups        = {Keep},
  primaryclass  = {hep-ph},
  slaccitation  = {%%CITATION = ARXIV:1810.07210;%%},
}

@Article{Ballett:2019bgd,
  author        = {Ballett, Peter and Boschi, Tommaso and Pascoli, Silvia},
  journal       = {JHEP},
  title         = {{Heavy Neutral Leptons from low-scale seesaws at the DUNE Near Detector}},
  year          = {2020},
  pages         = {111},
  volume        = {03},
  archiveprefix = {arXiv},
  doi           = {10.1007/JHEP03(2020)111},
  eprint        = {1905.00284},
  groups        = {Keep},
  primaryclass  = {hep-ph},
  reportnumber  = {IPPP/18/76},
}

@Article{Dercks:2018wum,
  author        = {Dercks, Daniel and Dreiner, Herbert K. and Hirsch, Martin and Wang, Zeren Simon},
  journal       = {Phys. Rev.},
  title         = {{Long-Lived Fermions at AL3X}},
  year          = {2019},
  number        = {5},
  pages         = {055020},
  volume        = {D99},
  archiveprefix = {arXiv},
  doi           = {10.1103/PhysRevD.99.055020},
  eprint        = {1811.01995},
  groups        = {Keep},
  primaryclass  = {hep-ph},
  reportnumber  = {BONN-TH-2018-14, DESY 18-197, IFIC/18-39, DESY-18-197},
  slaccitation  = {%%CITATION = ARXIV:1811.01995;%%},
}

@Article{SHiP:2018xqw,
  author        = {Ahdida, C. and others},
  journal       = {JHEP},
  title         = {{Sensitivity of the SHiP experiment to Heavy Neutral Leptons}},
  year          = {2019},
  pages         = {077},
  volume        = {04},
  archiveprefix = {arXiv},
  collaboration = {SHiP},
  doi           = {10.1007/JHEP04(2019)077},
  eprint        = {1811.00930},
  groups        = {Keep},
  primaryclass  = {hep-ph},
  slaccitation  = {%%CITATION = ARXIV:1811.00930;%%},
}

@Article{Liu:2019ayx,
  author        = {Liu, Jia and Liu, Zhen and Wang, Lian-Tao and Wang, Xiao-Ping},
  journal       = {JHEP},
  title         = {{Seeking for sterile neutrinos with displaced leptons at the LHC}},
  year          = {2019},
  pages         = {159},
  volume        = {07},
  archiveprefix = {arXiv},
  doi           = {10.1007/JHEP07(2019)159},
  eprint        = {1904.01020},
  groups        = {Keep},
  primaryclass  = {hep-ph},
  reportnumber  = {EFI-19-6},
}

@Article{Blondel:2014bra,
  author        = {Blondel, Alain and Graverini, E. and Serra, N. and Shaposhnikov, M.},
  journal       = {Nucl. Part. Phys. Proc.},
  title         = {{Search for Heavy Right Handed Neutrinos at the FCC-ee}},
  year          = {2016},
  pages         = {1883-1890},
  volume        = {273-275},
  archiveprefix = {arXiv},
  booktitle     = {{Proceedings, 37th International Conference on High Energy Physics (ICHEP 2014): Valencia, Spain, July 2-9, 2014}},
  collaboration = {FCC-ee study Team},
  doi           = {10.1016/j.nuclphysbps.2015.09.304},
  eprint        = {1411.5230},
  groups        = {Keep},
  primaryclass  = {hep-ex},
  slaccitation  = {%%CITATION = ARXIV:1411.5230;%%},
}

@Article{Shi:1993ee,
  author        = {Shi, X. and Sigl, G.},
  journal       = {Phys. Lett.},
  title         = {{A Type II supernovae constraint on electron-neutrino - sterile-neutrino mixing}},
  year          = {1994},
  note          = {[Erratum: Phys. Lett.B324,516(1994)]},
  pages         = {360-366},
  volume        = {B323},
  archiveprefix = {arXiv},
  doi           = {10.1016/0370-2693(94)90233-X,
	10.1016/0370-2693(94)91232-7},
  eprint        = {hep-ph/9312247},
  groups        = {Keep},
  primaryclass  = {hep-ph},
  reportnumber  = {FERMILAB-PUB-93-401-A},
  slaccitation  = {%%CITATION = HEP-PH/9312247;%%},
}

@Article{Nunokawa:1997ct,
  author        = {Nunokawa, H. and Peltoniemi, J. T. and Rossi, Anna and Valle, J. W. F.},
  journal       = {Phys. Rev.},
  title         = {{Supernova bounds on resonant active sterile neutrino conversions}},
  year          = {1997},
  pages         = {1704-1713},
  volume        = {D56},
  archiveprefix = {arXiv},
  doi           = {10.1103/PhysRevD.56.1704},
  eprint        = {hep-ph/9702372},
  groups        = {Keep},
  primaryclass  = {hep-ph},
  reportnumber  = {FTUV-96-81, IFIC-96-100},
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@article{Aielli:2019ivi,
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@article{Barouki:2022bkt,
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}