%0 Journal Article
%A Yu. A. Ignatov
%T Free and nonfree subgroups of $PSL_2(\mathbf C)$ generated by two parabolic elements
%J Sbornik. Mathematics
%D 1979
%P 49-55
%V 35
%N 1
%U http://geodesic.mathdoc.fr/item/SM_1979_35_1_a3/
%G en
%F SM_1979_35_1_a3