References

1. Brooks, David R.; and Hampshire, William F.II: Multiple Asteroid Flyby Missions. Physical Studies of the Minor Planets. NASA SP-267, 1971, pp. 527-537.
2. Bender, D. F.; and Friedlander, A. L.: Multi-Asteroid Flyby Trajectories Using Venus-Earth Gravity Assists. AAS/AIAA Astrodynamics Specialists Conference, Nassau, Bahamas, July 28-30, 1975.
3. Bender, D. F.; and Bourke, R. D.: Asteroid Rendezvous Missions. Physical Studies of the Minor Planets. NASA SP-267, 1971, pp. 503-511.
4. Mascy, Alfred C.; and Niehoff, John: Sample Return Missions to the Asteroid Eros. Physical Studies of the Minor Planets. NASA SP-267, 1971, 513-526.
5. O'Leary, Brian; Gaffey, Michael J.; Ross, David J.; and Salkeld, Robert: Retrieval of Asteroidal Materials. Space Resources and Space Settlements.NASA SP428,1979, pp. 173-189.
6. Bschorr, 0.; and Leibold, A.: Das Einfaung-und-Katapulvermogen von Planet/Mond-Systemen. Deutsche Luft-Und Raumfahrt, Rept. 68-81, NASA TT F-12, 330, JUly 1969.
7. Heppenheimer, Thomas A.: The Lunar Mass Transport Problem in Space Colonization. AAS/AlAA Astrodynamics Specialist Conference, Jackson Hole, Wyo., Sept. 7-9, 1977.

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