1. Hoffman, S.J., and D.I. Kaplan, Human Exploration of Mars: the Reference Mission of the NASA Mars Exploration Study Team, NASA SP-6107 (1997)
2. Bush, G.W., A Renewed Spirit of Discovery - The President's Vision for U.S. Space Exploration, Washington (2004)
3. Space radiation cancer risks and uncertainties for Mars missions;Cucinotta;Radiat. Res.,2001
4. Radiation Shielding Analysis for Deep Space Missions;De Angelis,2003