TY  - JOUR
AU  - Mawhin, J.
AU  - Willem, M.
TI  - Critical points of convex perturbations of some indefinite quadratic forms and semi-linear boundary value problems at resonance
JO  - Annales de l'I.H.P. Analyse non linéaire
PY  - 1986
SP  - 431
EP  - 453
VL  - 3
IS  - 6
PB  - Gauthier-Villars
UR  - http://archive.numdam.org/item/AIHPC_1986__3_6_431_0/
LA  - en
ID  - AIHPC_1986__3_6_431_0
ER  -