@article{AIHPC_1988__5_2_119_0, author = {Szulkin, Andrzej}, title = {Ljusternik-Schnirelmann theory on $C^1$-manifolds}, journal = {Annales de l'I.H.P. Analyse non lin\'eaire}, volume = {5}, year = {1988}, pages = {119-139}, mrnumber = {954468}, zbl = {0661.58009}, language = {en}, url = {http://dml.mathdoc.fr/item/AIHPC_1988__5_2_119_0} }
Szulkin, Andrzej. Ljusternik-Schnirelmann theory on $C^1$-manifolds. Annales de l'I.H.P. Analyse non linéaire, Tome 5 (1988) pp. 119-139. http://gdmltest.u-ga.fr/item/AIHPC_1988__5_2_119_0/
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