Voir la notice de l'article provenant de la source Math-Net.Ru
@article{MZM_1993_53_5_a2, author = {B. N. Biyarov and M. Otelbaev}, title = {A description of normal extensions}, journal = {Matemati\v{c}eskie zametki}, pages = {21--28}, publisher = {mathdoc}, volume = {53}, number = {5}, year = {1993}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1993_53_5_a2/} }
B. N. Biyarov; M. Otelbaev. A description of normal extensions. Matematičeskie zametki, Tome 53 (1993) no. 5, pp. 21-28. http://geodesic.mathdoc.fr/item/MZM_1993_53_5_a2/