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\bibitem{Aguiar_etal2010} Aguiar, P., Rafecas, M., Ortu{\~n}o, J. E., Kontaxakis, G., Santos, A., Pavia, J., et al. (2010). Geometrical and Monte Carlo projectors in 3D PET reconstruction. \textit{Med. Phys.}, \textit{37}(11), 5691--5702.

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