@article{AIHPC_1998__15_3_341_0, author = {Ekeland, Ivar and Ghoussoub, Nassif A.}, title = {$\mathbb {Z}\_2$-equivariant Ljusternik-Schnirelman theory for non-even functionals}, journal = {Annales de l'I.H.P. Analyse non lin\'eaire}, volume = {15}, year = {1998}, pages = {341-370}, mrnumber = {1629353}, zbl = {0907.58006}, language = {en}, url = {http://dml.mathdoc.fr/item/AIHPC_1998__15_3_341_0} }
Ekeland, I.; Ghoussoub, N. $\mathbb {Z}_2$-equivariant Ljusternik-Schnirelman theory for non-even functionals. Annales de l'I.H.P. Analyse non linéaire, Tome 15 (1998) pp. 341-370. http://gdmltest.u-ga.fr/item/AIHPC_1998__15_3_341_0/
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