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\bibitem{PTOLEMYCollaborationBetti_etal2019} PTOLEMY Collaboration(Betti, M. G. et al), de Salas, P. F., Gariazzo, S., \& Pastor, S. (2019). A design for an electromagnetic filter for precision energy measurements at the tritium endpoint. \textit{Prog. Part. Nucl. Phys.}, \textit{106}, 120--131.

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