no. 4
Existence of critical points for some noncoercive functionals
Annales de l'I.H.P. Analyse non linéaire, Tome 18 (2001) no. 4, pp. 437-457. 
@article{AIHPC_2001__18_4_437_0,
     author = {Arcoya, David and Boccardo, Lucio and Orsina, Luigi},
     title = {Existence of critical points for some noncoercive functionals},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {437--457},
     publisher = {Elsevier},
     volume = {18},
     number = {4},
     year = {2001},
     mrnumber = {1841128},
     zbl = {1035.49007},
     language = {en},
     url = {http://archive.numdam.org/item/AIHPC_2001__18_4_437_0/}
}
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Arcoya, David; Boccardo, Lucio; Orsina, Luigi. Existence of critical points for some noncoercive functionals. Annales de l'I.H.P. Analyse non linéaire, Tome 18 (2001) no. 4, pp. 437-457. http://archive.numdam.org/item/AIHPC_2001__18_4_437_0/

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