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\bibitem{Bolle_etal2012} Bolle, E., Casella, C., Chesi, E., De Leo, R., Dissertori, G., Fanti, V., et al. (2012). AX-PET: A novel PET concept with G-APD readout. \textit{Nucl. Instrum. Methods Phys. Res. A}, \textit{695}, 129--134.

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