1. Theorie Statisch Uberstimmer Tragewerke aus Idealplastichen Baustoft;Melan,1938
2. Theorie Statisch Uberstimmer Tragewerke aus Idealplastichen Baustoft;Melan,1938
3. General Theorems for Elastic-Plastic Bodies;Koiter,1960
4. Integrals Which are Convex Functionals;Rockafellar;Pacific J. Math.,1968
5. Linear Programming Methods in Analysis of Elastic-Plastic Systems;Chiras,1969