1. The theory of land locomotion;Bekker,1956
2. Off the road locomotion;Bekker,1960
3. The performance of rigid cylindrical wheels on clay soil;Uffelmann,1961
4. Prediction of rigid wheel performance based on the analysis of soil-wheel stresses, Part I. Performance of driven rigid wheels;Reece;J. Terramechanics,1967
5. The road sinkage equation in theory and practice;Wills,1966