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@article{DAN_1976_228_5_a5, author = {O. V. Mel'nikov}, title = {The congruence kernel of the group $\mathrm{SL}_2(\mathrm{Z})$}, journal = {Doklady Akademii Nauk}, pages = {1034--1036}, publisher = {mathdoc}, volume = {228}, number = {5}, year = {1976}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1976_228_5_a5/} }
O. V. Mel'nikov. The congruence kernel of the group $\mathrm{SL}_2(\mathrm{Z})$. Doklady Akademii Nauk, Tome 228 (1976) no. 5, pp. 1034-1036. http://geodesic.mathdoc.fr/item/DAN_1976_228_5_a5/