Ljusternik-Schnirelman theory with local Palais-Smale condition and singular dynamical systems
Annales de l'I.H.P. Analyse non linéaire, Tome 8 (1991) no. 5, pp. 459-476. 
@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/}
}
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Majer, P. Ljusternik-Schnirelman theory with local Palais-Smale condition and singular dynamical systems. Annales de l'I.H.P. Analyse non linéaire, Tome 8 (1991) no. 5, pp. 459-476. http://www.numdam.org/item/AIHPC_1991__8_5_459_0/

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