@article{JRAM_1989__402_153183,
     author = {G. Tomanov},
     title = {On the congruence-subgroup problem for some anisotropic algebraic groups over number fields.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {138--152},
     publisher = {mathdoc},
     volume = {402},
     year = {1989},
     zbl = {0673.20021},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1989__402_153183/}
}