@article{PMIHES_1967__33__59_0,
     author = {Bass, Hyman and Milnor, John and Serre, Jean-Pierre},
     title = {Solution of the congruence subgroup problem for $SL_n (n \ge 3)$ and $Sp_{2n} (n \ge 2)$},
     journal = {Publications Math\'ematiques de l'IH\'ES},
     pages = {59--137},
     publisher = {Institut des Hautes \'Etudes Scientifiques},
     volume = {33},
     year = {1967},
     mrnumber = {39 #5574},
     zbl = {0174.05203},
     language = {en},
     url = {http://archive.numdam.org/item/PMIHES_1967__33__59_0/}
}