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^Belfiore, Michael (2007). Rocketeers: how a visionary band of business leaders, engineers, and pilots is boldly privatizing space. New York: Smithsonian Books. p. 11. ISBN978-0-06-114903-0. "ロシアの宇宙計画がフロリダ州を拠点にしているスペース・アドベンチャーズ社との取引を打ち切った。2人の旅行者と1人のプロの宇宙飛行士を月に送り、月をフライバイするミッションだった。ミッション向けの主要なハードウェアは既に揃っている。いま必要なのは、その気のある2人の旅行者で、かつ1回につき1億ドルの旅費を支払える者を見つけることである。"