TY  - JOUR
AU  - D. A. Kazhdan
TI  - On A characteristic of congruence subgroups of the group $G=SL(2,\mathbb{Z})$
JO  - Funkcionalʹnyj analiz i ego priloženiâ
PY  - 1970
SP  - 89
EP  - 90
VL  - 4
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/FAA_1970_4_2_a14/
LA  - ru
ID  - FAA_1970_4_2_a14
ER  -