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Huebner, W.F., 1990. PHYSICS AND CHEMISTRY OF COMETS, Astronomy and Physics Library; Springer-Verlag, NY, ISBM 3-540-51288-4
Kuck, David L., 1995, EXPLOITATION OF SPACE OASES, Proceedings of the 12th SSI -Princeton Conference, Space Studies Institute, Princeton, NJ.
Wetherill, G.W., 1991, OCCURRENCE OF COMETS IN THE APOLLO OBJECTION POPULATION. Presented at the International Conference on Near-Earth Asteroids; NEA DYNAMICS; II, San Juan Capistrano Research Institute; San Juan Capistrano, CA, July.
Zuppero, A., 1992. ROCKET FUEL TO EARTH ORBITS FROM NEAR-EARTH ASTEROIDS AND COMETS; In Proceedings of the Third International Conference, Engineering, Construction, and Operations in Space III; Sadeh, W.Z.; Sture, S.; Miller, R.J. (Eds.); Denver, CO, Space '92, Vol. 2, pp. 2271-2281.
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