1. Boundary value problems in elasticity with unilateral constraints;Fichera,1972
2. A survey of the mechanics of contact between solid bodies;Kalker;ZAMM,1977
3. Convex analysis and unilateral static problems;Panagiotopoulos;Ing. Arch.,1976
4. Problemi di vincolamento monolatero negli spostamenti di sistemi discreti;Cannarozzi,1976
5. Analysis of unilateral contact problem;Panagiotopoulos;J. Eng. Mech. Div. ASCE,1976