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\bibitem{Solevi_etal2013} Solevi, P. et al, Oliver, J. F., Gillam, J. E., \& Rafecas, M. (2013). A Monte-Carlo based model of the AX-PET demonstrator and its experimental validation. \textit{Phys. Med. Biol.}, \textit{58}(16), 5495--5510.

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