%0 Journal Article
%A Fine, Benjamin
%T Congruence Subgroups of the Picard Group
%J Canadian journal of mathematics
%D 1980
%P 1474-1481
%V 32
%N 6
%U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1980-116-7/
%R 10.4153/CJM-1980-116-7
%F 10_4153_CJM_1980_116_7