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\bibitem{Asai_etal2021} Asai, M., Cortes-Giraldo, M. A., Gimenez-Alventosa, V., Gimenez, V., \& Salvat, F. (2021). The PENELOPE Physics Models and Transport Mechanics. Implementation into Geant4. \textit{Front. Physics}, \textit{9}, 738735--20pp.

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