Landis, Geoffrey A. (Feb. 2-6 de 2003). «Colonization of Venus». Conference on Human Space Exploration, Space Technology & Applications International Forum, Albuquerque NM.
Landis, Geoffrey A. (Feb. 2-6 de 2003). «Colonization of Venus». Conference on Human Space Exploration, Space Technology & Applications International Forum, Albuquerque NM.