@article{GDZPPN002230429, title = {Critical orbits of symmetric functionals.}, journal = {Manuscripta mathematica}, volume = {67}, year = {1990}, pages = {129-152}, zbl = {0755.58018}, url = {http://dml.mathdoc.fr/item/GDZPPN002230429} }
Bartsch, Thomas. Critical orbits of symmetric functionals.. Manuscripta mathematica, Tome 67 (1990) pp. 129-152. http://gdmltest.u-ga.fr/item/GDZPPN002230429/