%0 Journal Article
%A Mawhin, J.
%A Willem, M.
%T Critical points of convex perturbations of some indefinite quadratic forms and semi-linear boundary value problems at resonance
%J Annales de l'I.H.P. Analyse non linéaire
%D 1986
%P 431-453
%V 3
%N 6
%I Gauthier-Villars
%U http://www.numdam.org/item/AIHPC_1986__3_6_431_0/
%G en
%F AIHPC_1986__3_6_431_0