1. Upper-bound values for the loads on a rigid-plastic body in plane strain;Westwood;J. Mech. Eng. Sci.,1960
2. Equilibrium method and the upper-bound theorem in plane problems of plastic flow with account for coulomb friction;Grzymkowski,1972
3. Limit analysis of flow through inclined converging planes;Kiuchi;ASME, J. Eng. Ind.,1980
4. A friction model based on the upper-bound approach to the ridge and sublayer deformations;Avitzur;Wear,1984
5. A friction model based on the upper-bound approach to the ridge and sublayer deformations — update;Avitzur,1985