%0 Journal Article %A Monica Clapp %T Critical point theory for perturbations of symmetric functionals. %J Commentarii mathematici Helvetici %D 1996 %P 570 %V 71 %N 2 %I mathdoc %U https://geodesic-test.mathdoc.fr/item/CMH_1996__71_2_140414/ %G un %F CMH_1996__71_2_140414