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1. The path from LEO to Mars : hearing before the Committee on Commerce, Science, and Transportation, United States Senate, One Hundred Twelfth Congress, second session, September 12, 2012

4. President's request for Mars and lunar missions : hearing before the Subcommittee on Space Science and Applications of the Committee on Science, Space, and Technology, U.S. House of Representatives, One Hundred First Congress, first session, September 26, 1989