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References
- ↑ "Lunar Orbit Insertion Targeting and Associated Outbound Mission Design for Lunar Sortie Missions" (PDF). NASA. 2007.
- ↑ "NASA Unveils Global Exploration Strategy and Lunar Architecture". NASA. 2006.
- ↑ Lunar Mission, SpaceAdventures website, undated, accessed 2010-05-24.
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