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\bibitem{Gomez-Cadenas_etal2012} Gomez-Cadenas, J. J., Martin-Albo, J., Mezzetto, M., Monrabal, F., \& Sorel, M. (2012). The search for neutrinoless double beta decay. \textit{Riv. Nuovo Cimento}, \textit{35}(2), 29--98.

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