1. THEORETICAL SOIL MECHANICS;Terzaghi,1943
2. ON STRESS-STRAIN RELATIONS FOR SOILS AND LOAD CARRYING CAPACITY;Drucker,1961
3. STATICS OF GRANULAR MEDIA;Sokoloviskii,1965
4. A MORE FUNDAMENTAL APPROACH TO STRESS-STRAIN RELATIONS;Drucker,1951
5. EXTENDED LIMIT DESIGN THEOREMS OF CONTINUOUS MEDIA;Drucker;Quarterly Applied Mathematics,1952