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\bibitem{Ortega_etal2015} Ortega, P. G., Torres-Espallardo, I., Cerutti, F., Ferrari, A., Gillam, J. E., Lacasta, C., et al. (2015). Noise evaluation of Compton camera imaging for proton therapy. \textit{Phys. Med. Biol.}, \textit{60}(5), 1845--1863.

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