1. NASA Standard for Models and Simulations: Philosophy and Requirements Overview
2. 4Wilson, J.W., Townsend, L.W., Schimmerling,W., Khandelwal,G.S., Khan, F., Nealy, J.E., Cucinotta,F.A., Simonsen, L.C., Shinn, J.L., and Norbury, J.W. "Transport Methods and interactions for Space Radiations",NASA RP-1257, 1991.