@article{CMH_1996__71_2_140414,
     author = {Monica Clapp},
     title = {Critical point theory for perturbations of symmetric functionals.},
     journal = {Commentarii mathematici Helvetici},
     pages = {570},
     publisher = {mathdoc},
     volume = {71},
     number = {2},
     year = {1996},
     zbl = {0873.58018},
     language = {un},
     url = {https://geodesic-test.mathdoc.fr/item/CMH_1996__71_2_140414/}
}