%0 Journal Article
%A J.L. Brenner
%A R.C. Lyndon
%T Maximal Nonparabolic Subgroups of the Modular Group.
%J Mathematische Annalen
%D 1983
%P 1-12
%V 263
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MAN_1983__263_163727/
%F MAN_1983__263_163727