%0 Journal Article
%A V. R. Portnov
%T On the solvability of nonlinear operator equations in Banach spaces
%J Doklady Akademii Nauk
%D 1975
%P 52-55
%V 225
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1975_225_1_a12/
%G ru
%F DAN_1975_225_1_a12