1. Mechanics of soil as influenced by model tillage tools;Siemens;Transactions of ASAE,1965
2. The relationship between the mechanical properties of soil and the performance of simple cultivation implements;Payne;Journal of Agricultural Engineering Research,1956
3. Some basic consideration of soil mechanics as applied to agricultural engineering;Sohne;Grundlagen der Landtechnik,1956
4. Soil failure and pressure patterns for flat cutting blades;Elijah;Transactions of the ASAE,1971
5. An investigation of a plane strain continuous penetration problem;Butterfield;Geotechnique,1972