MathSciNet bibliographic data MR954468 58E05 (58C40) Szulkin, Andrzej Ljusternik-Schnirelmann theory on ${\it C}^1$${\it C}^1$-manifolds. Ann. Inst. H. Poincaré Anal. Non Linéaire 5 (1988), no. 2, 119–139. Article

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