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. Terramechanics,1964
3. The calculation of passive pressure in two dimensional soil fatigue;Hettiaratchi;J. agric. Engng Res.,1966
4. Cleavage of soil by tined implements;O'Callaghan;J. agric. Engng Res.,1964
5. Symmetrical three dimensional soil failure;Hettiaratchi;J. Terramechanics,1967