%0 Journal Article
%A J. Rohlfs
%A G.A. Margulis
%T On the Proportionality of Covolumes of Discrete Subgroups.
%J Mathematische Annalen
%D 1986
%P 197-206
%V 275
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MAN_1986__275_164143/
%F MAN_1986__275_164143