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\bibitem{Becker_etal2017} Becker, R., Buck, A., Casella, C., Dissertori, G., Fischer, J., Howard, A., et al. (2017). The SAFIR experiment: Concept, status and perspectives. \textit{Nucl. Instrum. Methods Phys. Res. A}, \textit{845}, 648--651.

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