%0 Journal Article %A Weisz, Juraj %T A posteriori error estimate of approximate solutions to a mildly nonlinear elliptic boundary value problem %J Commentationes Mathematicae Universitatis Carolinae %D 1990 %P 315-322 %V 31 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMUC_1990__31_2_a13/ %G en %F CMUC_1990__31_2_a13