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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

6. Planetary flagship missions : Mars Rover 2020 and Europa Clipper : hearing before the Subcommittee on Space, Committee on Science, Space, and Technology, House of Representatives, One Hundred Fifteenth Congress, first session, July 18, 2017