1. Araya, J.C., 1981. Soil failure by introducing fluid under pressure, Proceedings of the International Conference of Soil Dynamics, Auburn University, Auburn, Ala. 3, pp. 450–470.
2. Experimental Soil Mechanics;Bardet,1997
3. Two-dimensional forces recorded on bi-level subsoilers in tandem;du Plessis;Agric. Eng. South Africa,2003
4. Soil failure with narrow tines;Godwin;J. Agric. Eng. Res.,1977
5. Soil reacting forces for bentleg plow;Harrison;Trans. ASAE,1990