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@article{CMH_1996__71_2_140414, author = {Monica Clapp}, title = {Critical point theory for perturbations of symmetric functionals.}, journal = {Commentarii mathematici Helvetici}, pages = {570--593}, publisher = {mathdoc}, volume = {71}, number = {2}, year = {1996}, zbl = {0873.58018}, url = {http://geodesic.mathdoc.fr/item/CMH_1996__71_2_140414/} }
Monica Clapp. Critical point theory for perturbations of symmetric functionals.. Commentarii mathematici Helvetici, Tome 71 (1996) no. 2, pp. 570-593. http://geodesic.mathdoc.fr/item/CMH_1996__71_2_140414/