%0 Journal Article
%A N. V. Marchenko
%T On the extension of an operator and the existence of fixed points
%J Doklady Akademii Nauk
%D 1962
%P 1026-1028
%V 147
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1962_147_5_a9/
%G ru
%F DAN_1962_147_5_a9