%0 Journal Article
%A R. L. Frum-Ketkov
%T Mappings into a sphere of a Banach space
%J Doklady Akademii Nauk
%D 1967
%P 1229-1231
%V 175
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1967_175_6_a7/
%G ru
%F DAN_1967_175_6_a7