1. The mechanics of soil cutting blades;Osman;J. agric. Engng Res.,1964
2. Soil bin and model studies on tillage tools and traction devices;Siemens;J. Terramech.,1964
3. The calculation of passive pressure in two-dimensional soil failure;Hettiaratchi;J. agric. Engng Res.,1966
4. The relationship between the mechanical properties of soil and the performance of simple cultivation implements;Payne;J. agric. Engng Res.,1956
5. Cleavage of soil by tined implements;O'Callaghan;J. agric. Engng Res.,1964