%0 Journal Article %A Kačur, J. %T On existence of the weak solution for non-linear partial differential equations of elliptic type %J Commentationes Mathematicae Universitatis Carolinae %D 1970 %P 137-181 %V 11 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMUC_1970__11_1_a9/ %G en %F CMUC_1970__11_1_a9