@article{JRAM_1990__411_153266,
     author = {D. Percivale},
     title = {Perfectly plastic plates: a variational definition.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {39--50},
     year = {1990},
     volume = {411},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1990__411_153266/}
}