@article{AIHPC_1985__2_5_329_0, author = {Dancer, Edward Norman}, title = {A new degree for $S^1$-invariant gradient mappings and applications}, journal = {Annales de l'I.H.P. Analyse non lin\'eaire}, volume = {2}, year = {1985}, pages = {329-370}, mrnumber = {817033}, zbl = {0579.58022}, language = {en}, url = {http://dml.mathdoc.fr/item/AIHPC_1985__2_5_329_0} }
Dancer, E. N. A new degree for $S^1$-invariant gradient mappings and applications. Annales de l'I.H.P. Analyse non linéaire, Tome 2 (1985) pp. 329-370. http://gdmltest.u-ga.fr/item/AIHPC_1985__2_5_329_0/
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