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\bibitem{Cepedello_etal2019} Cepedello, R., Deppisch, F. F., Gonzalez, L., Hati, C., \& Hirsch, M. (2019). Neutrinoless Double-Beta Decay with Nonstandard Majoron Emission. \textit{Phys. Rev. Lett.}, \textit{122}(18), 181801--6pp.

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