%0 Journal Article %A Quittner, Pavol %T Singular sets and number of solutions of nonlinear boundary value problems %J Commentationes Mathematicae Universitatis Carolinae %D 1983 %P 371-385 %V 24 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMUC_1983__24_2_a15/ %G en %F CMUC_1983__24_2_a15