TY  - BOOK
AU  - Sury, B.
TI  - Congruence Subgroup Problem: An Elementary Approach aimed at applications
T2  - Texts and Readings in Mathematics
SN  - 8585931380
U1  - 512.72 
PY  - 2003///
CY  - New Delhi
PB  - Hinudstan Book Agency
ER  -