Minimax principles for lower semicontinuous functions and applications to nonlinear boundary value problems
Annales de l'I.H.P. Analyse non linéaire, Tome 3 (1986) no. 2, pp. 77-109. 
@article{AIHPC_1986__3_2_77_0,
     author = {Szulkin, Andrzej},
     title = {Minimax principles for lower semicontinuous functions and applications to nonlinear boundary value problems},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {77--109},
     publisher = {Gauthier-Villars},
     volume = {3},
     number = {2},
     year = {1986},
     mrnumber = {837231},
     zbl = {0612.58011},
     language = {en},
     url = {http://archive.numdam.org/item/AIHPC_1986__3_2_77_0/}
}
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Szulkin, Andrzej. Minimax principles for lower semicontinuous functions and applications to nonlinear boundary value problems. Annales de l'I.H.P. Analyse non linéaire, Tome 3 (1986) no. 2, pp. 77-109. http://archive.numdam.org/item/AIHPC_1986__3_2_77_0/

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