1. Bekker, M.G., (1969) Introduction to Terrain-vehicle Systems. University of Michigan Press, Ann Arbor.
2. Bessenov, A.P. and Umnov, N.V., (1973) The analysis of gaits in six-legged vehicles according to their static stability. Proc. of Symposium on Theory and Practice of Robots and Manipulators, Udine, Italy.
3. Cox, W., (1970) Big Muskie. News in Engineering, Ohio State University, Columbus, (25–27).
4. Frank, A.A., (1968) Automatic control systems for legged locomotion. Ph.D. Dissertation, Univ. of Southern California, Los Angeles.
5. Frank, A.A. and McGhee, R.B., (1969) Some considerations relating to the design of autopilots for legged vehicles. J. Terramechanics. 6, 23–25.