Critical points of convex perturbations of some indefinite quadratic forms and semi-linear boundary value problems at resonance
Annales de l'I.H.P. Analyse non linéaire, Tome 3 (1986) no. 6, pp. 431-453. 
@article{AIHPC_1986__3_6_431_0,
     author = {Mawhin, J. and Willem, M.},
     title = {Critical points of convex perturbations of some indefinite quadratic forms and semi-linear boundary value problems at resonance},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {431--453},
     publisher = {Gauthier-Villars},
     volume = {3},
     number = {6},
     year = {1986},
     mrnumber = {870864},
     zbl = {0678.35091},
     language = {en},
     url = {http://www.numdam.org/item/AIHPC_1986__3_6_431_0/}
}
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Mawhin, J.; Willem, M. Critical points of convex perturbations of some indefinite quadratic forms and semi-linear boundary value problems at resonance. Annales de l'I.H.P. Analyse non linéaire, Tome 3 (1986) no. 6, pp. 431-453. http://www.numdam.org/item/AIHPC_1986__3_6_431_0/

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