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@article{DAN_1989_306_6_a4, author = {A. S. Rapinchuk}, title = {On the congruence subgroup problem for algebraic groups}, journal = {Doklady Akademii Nauk}, pages = {1304--1307}, publisher = {mathdoc}, volume = {306}, number = {6}, year = {1989}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1989_306_6_a4/} }
A. S. Rapinchuk. On the congruence subgroup problem for algebraic groups. Doklady Akademii Nauk, Tome 306 (1989) no. 6, pp. 1304-1307. http://geodesic.mathdoc.fr/item/DAN_1989_306_6_a4/