1. L.A. Taylor and W.D. Carrier, III: AIAA J., 1992, vol. 30, no. 12, pp. 2858–63.
2. W. Seboldt, S. Lingner, S. Hoernes, W. Grimmeisen, R. Lekies, R. Herkelmann, and D.M. Burt: Resources of Near-Earth Space, University of Arizona Press, Tucson, AZ, 1991, p. 11.
3. W.H. Steurer: Space Manufacturing 5th ed., eds. B. Faughnan and G. Maryniak, American Institute of Aeronautics and Astronautics, Reston, VA, 1985, p. 123.
4. A.H. Cutler and P. Krag: Lunar Bases and Space Activities of the 21 st Century, Ed. W.W. Mendell, Lunar and Planetary Institute, Houston, TX, 1985, pp. 559–68.
5. L.A. Taylor and W.D. Carrier, III: Resources of Near-Earth Space, Eds. J.S. Lewis, M.S. Matthews, and M.L. Guerrier, The University of Arizona Press, Tucson, AZ, 1993, pp. 69–108.