%0 Journal Article %A Petry, Walter %T Nonlinear operator equations and boundary-value problems %J Commentationes Mathematicae Universitatis Carolinae %D 1974 %P 451-463 %V 15 %N 3 %U http://geodesic.mathdoc.fr/item/CMUC_1974_15_3_a5/ %G en %F CMUC_1974_15_3_a5