%0 Journal Article
%A N. A. Gusevskii
%T On the fundamental group of a manifold of negative curvature
%J Doklady Akademii Nauk
%D 1983
%P 777-781
%V 268
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1983_268_4_a0/
%G ru
%F DAN_1983_268_4_a0