@article{MM2_1990__66_1_155464,
     author = {Thomas Bartsch},
     title = {Critical orbits of symmetric functionals.},
     journal = {Manuscripta mathematica},
     pages = {129--152},
     publisher = {mathdoc},
     volume = {66},
     number = {1},
     year = {1990},
     zbl = {0755.58018},
     url = {http://geodesic.mathdoc.fr/item/MM2_1990__66_1_155464/}
}