@article{PMIHES_1974__44__241_0,
     author = {Jean-Pierre Serre},
     title = {On a functorial property of power residue symbols. {Erratum} : {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 = {241--244},
     year = {1974},
     publisher = {Institut des Hautes \'Etudes Scientifiques},
     volume = {44},
     doi = {10.1007/BF02685884},
     mrnumber = {50 #12972},
     zbl = {0297.20054},
     language = {en},
     url = {https://pmihes.centre-mersenne.org/articles/10.1007/BF02685884/}
}