%0 Journal Article %A Piotr FijaƂkowski %T On the solvability of nonlinear elliptic equations in Sobolev spaces %J Annales Polonici Mathematici %D 1991 %P 149-156 %V 56 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/ap-56-2-149-156/ %R 10.4064/ap-56-2-149-156 %G en %F 10_4064_ap_56_2_149_156