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@article{JRAM_1991__418_153332, author = {Dieter Puppe and M\'onica Clapp}, title = {Critical point theory with symmetries.}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {1--30}, publisher = {mathdoc}, volume = {418}, year = {1991}, zbl = {0722.58011}, url = {http://geodesic.mathdoc.fr/item/JRAM_1991__418_153332/} }
Dieter Puppe; Mónica Clapp. Critical point theory with symmetries.. Journal für die reine und angewandte Mathematik, Tome 418 (1991), pp. 1-30. http://geodesic.mathdoc.fr/item/JRAM_1991__418_153332/