%0 Journal Article
%A S. V. Buyalo
%T Volume and fundamental group of a manifold of nonpositive curvature
%J Sbornik. Mathematics
%D 1985
%P 137-150
%V 50
%N 1
%U http://geodesic.mathdoc.fr/item/SM_1985_50_1_a8/
%G en
%F SM_1985_50_1_a8