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2. Marsnet — Phase-A Study Report;Chicarro,1993
3. Modelling, Simulation and Sounding of Cometary Nuclei,1992
4. Terrain-Vehicle Dynamic Interaction Studies of a Mobility Concept (ELMS) for Planetary Surface Exploration;Costes;AIAA 73-407,1973
5. Lunar Sourcebook — A User Guide to the Moon;Heiken,1991