1. Theory of Land Locomotion;Bekker,1956
2. Off-the-road Locomotion;Bekker,1960
3. Introduction to Terrain-Vehicle Systems;Bekker,1969
4. The steering of tracked vehicles by articulation;Nuttall,1961
5. Some notes on the steering of tracked vehicles by articulation;Nuttall;J. Terramechanics,1964