1. Steering and traction characteristics of rubber-tired and crawler vehicles;Adams;SAE Trans.,1959
2. Introduction to Terrain-Vehicle System;Bekker,1969
3. Soil Compaction, Fuel Economy and Tractor Wheels. A Method of Inquiry;Bekker;Tek. Not. SFM,1976
4. Earthmoving pulling machines;Brach,1986
5. New positive steering system;Buerschinger;SAE J.,1964