%0 Journal Article
%A R. A. Polyak
%T On finding a fixed point of a class of set-valued mappings
%J Doklady Akademii Nauk
%D 1978
%P 1252-1255
%V 242
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1978_242_6_a3/
%G ru
%F DAN_1978_242_6_a3