%0 Journal Article
%A Gelbukh, Irina
%T Co-rank and Betti number of a group
%J Czechoslovak Mathematical Journal
%D 2015
%P 565-567
%V 65
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.1007/s10587-015-0195-0/
%R 10.1007/s10587-015-0195-0
%G en
%F 10_1007_s10587_015_0195_0