%0 Journal Article
%A G. Rosenberger
%T On free subgroups of generalized triangle groups
%J Algebra i logika
%D 1989
%P 227-240
%V 28
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/AL_1989_28_2_a6/
%G en
%F AL_1989_28_2_a6