TY  - JOUR
AU  - Alexander Lubotzky
TI  - Subgroup growth and congruence subgroups.
JO  - Inventiones mathematicae
PY  - 1995
SP  - 267
EP  - 296
VL  - 119
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/IM_1995__119_3_144257/
ID  - IM_1995__119_3_144257
ER  -