@article{GDZPPN002102978,
title = {On the congruence subgroup problem, II.},
journal = {Inventiones mathematicae},
volume = {83},
year = {1986},
pages = {73-118},
zbl = {0603.20044},
url = {http://dml.mathdoc.fr/item/GDZPPN002102978}
}
Raghunathan, M.S. On the congruence subgroup problem, II.. Inventiones mathematicae, Tome 83 (1986) pp. 73-118. http://gdmltest.u-ga.fr/item/GDZPPN002102978/