1. Bekker M. G. (1956). “Theory of land locomotion.” University of Michigan Press Ann Arbor.
2. Brown D. Webster G. (2010). “Now a stationary research platform NASA’s Mars rover Spirit starts a new chapter in red planet scientific studies.” NASA Press Release.
3. Callas J. L. (2015). “Mars Exploration Rover Spirit End of Mission Report.” NASA Technical Report JPL D-92756.
4. Carrier III W. D. Olhoeft G. R. & Mendell W. (1991). “Physical properties of the lunar surface.” Lunar sourcebook: A user's guide to the Moon 475–594.
5. Costes N. C. Farmer J. E. George E. B. (1972). “Mobility Performance of the Lunar Roving Vehicle: Terrestrial Studies Apollo 15 Results.” NASA Technical Report TR-R401.