%0 Journal Article
%A F. Ya. Vetukhnovskii
%T On the coverings of a graph by a system of neighborhoods of its vertices
%J Doklady Akademii Nauk
%D 1964
%P 21-24
%V 158
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1964_158_1_a3/
%G ru
%F DAN_1964_158_1_a3