Voir la notice de l'article provenant de la source Math-Net.Ru
@article{AL_1970_9_6_a1, author = {L. N. Vaserstein and A. V. Mikhalev}, title = {The normal subgroups of the orthogonal group over a ring with}, journal = {Algebra i logika}, pages = {629--632}, publisher = {mathdoc}, volume = {9}, number = {6}, year = {1970}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1970_9_6_a1/} }
L. N. Vaserstein; A. V. Mikhalev. The normal subgroups of the orthogonal group over a ring with. Algebra i logika, Tome 9 (1970) no. 6, pp. 629-632. http://geodesic.mathdoc.fr/item/AL_1970_9_6_a1/