%0 Journal Article
%A V. M. Bykov
%T On closed coverings of manifolds and linking of cycles
%J Doklady Akademii Nauk
%D 1973
%P 1027-1030
%V 211
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1973_211_5_a3/
%G ru
%F DAN_1973_211_5_a3