%0 Journal Article
%A V. R. Portnov
%T On the solvability of a nonlinear operator equation
%J Doklady Akademii Nauk
%D 1976
%P 1301-1304
%V 227
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1976_227_6_a5/
%G ru
%F DAN_1976_227_6_a5