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\bibitem{NEXTCollaborationCebrian_etal2017} NEXT Collaboration(Cebrian, S. et al), Perez, J., Alvarez, V., Benlloch-Rodriguez, J., Botas, A., Carcel, S., et al. (2017). Radiopurity assessment of the energy readout for the NEXT double beta decay experiment. \textit{J. Instrum.}, \textit{12}, T08003--20pp.

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