@article{GDZPPN002207109,
title = {On the congruence-subgroup problem for some anisotropic algebraic groups over number fields.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {394},
year = {1989},
pages = {138-152},
zbl = {0673.20021},
url = {http://dml.mathdoc.fr/item/GDZPPN002207109}
}
Tomanov, G. On the congruence-subgroup problem for some anisotropic algebraic groups over number fields.. Journal für die reine und angewandte Mathematik, Tome 394 (1989) pp. 138-152. http://gdmltest.u-ga.fr/item/GDZPPN002207109/