1. A more fundamental approach to stress-strain relations;Drucker,1951
2. On uniqueness in the theory of plasticity;Drucker;Quart. Appl. Math.,1956
3. A definition of stable inelastic material;Drucker;J. appl. Mech.,1959
4. A theory of the plastic distortion of a polycrystalline aggregate under combined stresses;Bishop;Phil. Journ.,1951
5. A general theory of uniqueness and stability in elastic-plastic solids;Hill;J. Mech. Phys. Solids,1958