%0 Journal Article
%A Holger Meinert
%T The geometric invariants of direct products of virtually free groups.
%J Commentarii mathematici Helvetici
%D 1994
%P 39-48
%V 69
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/CMH_1994__69_4_140325/
%F CMH_1994__69_4_140325