@article{AIHPC_1991__8_5_459_0,
     author = {Majer, P.},
     title = {Ljusternik-Schnirelman theory with local {Palais-Smale} condition and singular dynamical systems},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {459--476},
     publisher = {Gauthier-Villars},
     volume = {8},
     number = {5},
     year = {1991},
     mrnumber = {1136352},
     zbl = {0749.58046},
     language = {en},
     url = {http://www.numdam.org/item/AIHPC_1991__8_5_459_0/}
}