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\bibitem{Pino_etal2011} Pino, F., Roe, N., Orero, A., Falcon, C., Rojas, S., Benlloch, J. M., et al. (2011). Development of a variable-radius pinhole SPECT system with a portable gamma camera. \textit{Rev. Esp. Med. Nucl.}, \textit{30}(5), 286--291.

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