1. Off-the-road locomotion;Bekker,1960
2. Land locomotion—simulation and control;Tomovic,1961
3. Walking machines;Liston;J. Terramechanics,1964
4. The development of a quadruped walking machine;Liston;ASME Paper 67-Tran-34,1967
5. Finite state control of quadruped locomotion;McGhee;Simulation,1967