@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}, volume = {3}, year = {1986}, pages = {77-109}, mrnumber = {837231}, zbl = {0612.58011}, language = {en}, url = {http://dml.mathdoc.fr/item/AIHPC_1986__3_2_77_0} }
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) pp. 77-109. http://gdmltest.u-ga.fr/item/AIHPC_1986__3_2_77_0/
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