Inter-comparison of Dose Distributions Calculated by FLUKA, GEANT4, MCNP, and PHITS for Proton TherapyZi-Yi Yang, Pi-En Tsai, Shao-Chun Lee, Yen-Chiang Liu, Chin-Cheng Chen, Tatsuhiko Sato and Rong-Jiun SheuEPJ Web Conf., 153 (2017) 04011DOI: https://doi.org/10.1051/epjconf/201715304011