%0 Journal Article
%A R. Rankin
%T Subgroups of the modular group defined by a single linear congruence
%J Acta Arithmetica
%D 1973
%P 313-323
%V 24
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.4064/aa-24-3-313-323/
%R 10.4064/aa-24-3-313-323
%G en
%F 10_4064_aa_24_3_313_323