TY  - JOUR
AU  - Gopal Prasad
AU  - M.S. Raghunathan
TI  - On the Congruence Subgroups Problem: Determination of the 
JO  - Inventiones mathematicae
PY  - 1983
SP  - 21
EP  - 42
VL  - 71
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/IM_1983__71_142983/
ID  - IM_1983__71_142983
ER  -