TY  - JOUR
AU  - Vladimir A. Koibaev
TI  - On a question about generalized congruence subgroups
JO  - Žurnal Sibirskogo federalʹnogo universiteta. Matematika i fizika
PY  - 2018
SP  - 66
EP  - 69
VL  - 11
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/JSFU_2018_11_1_a9/
LA  - en
ID  - JSFU_2018_11_1_a9
ER  -