@article{1103905401, author = {Palais, Richard S.}, title = {The principle of symmetric criticality}, journal = {Comm. Math. Phys.}, volume = {64}, number = {3}, year = {1979}, pages = { 19-30}, language = {en}, url = {http://dml.mathdoc.fr/item/1103905401} }
Palais, Richard S. The principle of symmetric criticality. Comm. Math. Phys., Tome 64 (1979) no. 3, pp. 19-30. http://gdmltest.u-ga.fr/item/1103905401/