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2. ESA, Technologies for Space Exploration Roadmaps, 1st Ed., July 2012.
3. NASA, Introduction, Crosscutting Technologies, and Index, NASA Technology Roadmaps Draft, May 2015.
4. ASD-Eurospace, RT priorities 2012, Space R&T Priorities, March 2012.
5. International Space Exploration Coordination Group (ISECG), The Global Exploration Roadmap, August 2013, 〈http://www.globalspaceexploration.org〉.