%0 Journal Article %A Rudolf, Boris %T Existence theorems for nonlinear operator equation $Lu+Nu=f$ and some properties of the set of its solutions %J Mathematica slovaca %D 1992 %P 55-63 %V 42 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/MASLO_1992__42_1_a4/ %G en %F MASLO_1992__42_1_a4