%0 Journal Article
%A W.V. PETRYSHYN
%T On the Approximation-Solvability of Nonlinear Equations.
%J Mathematische Annalen
%D 1968
%P 156-164
%V 177
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MAN_1968__177_161714/
%F MAN_1968__177_161714