Implementation and validation of the GEANT4/AtRIS code to model the radiation environment at MarsJingnan Guo, Saša Banjac, Lennart Röstel, Jan C. Terasa, Konstantin Herbst, Bernd Heber and Robert F. Wimmer-SchweingruberJ. Space Weather Space Clim., 9 (2019) A2DOI: https://doi.org/10.1051/swsc/2018051