1. Extended limit design theorems for continuous media;Drucker;Quart Appl Math, Brown University,1952
2. Calcul Plastique des Constructions;Massonet,1978
3. Plasticity: Theory and Engineering Applications;Kaliszky,1989
4. Plasticity Theory;Lubliner,1990
5. Inelastic Analysis of Structures;Jirasek,2002