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\bibitem{NEXTCollaborationCebrian_etal2015} NEXT Collaboration(Cebrian, S. et al), Alvarez, V., Carcel, S., Cervera-Villanueva, A., Diaz, J., Ferrario, P., et al. (2015). Radiopurity assessment of the tracking readout for the NEXT double beta decay experiment. \textit{J. Instrum.}, \textit{10}, P05006--16pp.

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