1. 2"Space Settlements - a Design Study," Tech. Rep. NASA SP-413, Scientific and Technical Information Office, NASA,Washington, D. C., 1977, Authored by the Participants of the 1975 Summer Faculty Fellowship Program in Engineering Systems Design, under the sponsorship of NASA and the American Society for Engineering Education and directed byNASA Ames RC and Stanford University.
2. 3Henderson, E. M. and Holderman, M. L. "Technology Applications that Support Space Exploration," AIAA Paper 2011-5570.
3. 5Keffer, C. O. "Experimental Investigation of Packaging and Deployment Characteristics of an Inflatable Toroidal-Space-Station Configuration," Technical Report NASA-TM-X-1079, NASA Langley Research Center, Hampton, VA, April11965.