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\bibitem{Song_etal2016} Song, N. Q., Garcia, R. B., Gomez-Cadenas, J. J., Gonzalez-Garcia, M. C., Conde, A. P., \& Taron, J. (2016). Conditions for statistical determination of the neutrino mass spectrum in radiative emission of neutrino pairs in atoms. \textit{Phys. Rev. D}, \textit{93}(1), 013020--10pp.

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