%0 Journal Article
%A Stothers, W. W.
%T Subgroups of infinite index in the modular group III
%J Glasgow mathematical journal
%D 1981
%P 119-131
%V 22
%N 2
%U http://geodesic.mathdoc.fr/articles/10.1017/S0017089500004559/
%R 10.1017/S0017089500004559
%F 10_1017_S0017089500004559