@article{PMIHES_1976__46__107_0,
     author = {Raghunathan, Madabusi S.},
     title = {On the congruence subgroup problem},
     journal = {Publications Math\'ematiques de l'IH\'ES},
     pages = {107--161},
     publisher = {Institut des Hautes \'Etudes Scientifiques},
     volume = {46},
     year = {1976},
     mrnumber = {58 #22325},
     zbl = {0347.20027},
     language = {en},
     url = {http://www.numdam.org/item/PMIHES_1976__46__107_0/}
}