Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1967_172_1_a6, author = {V. T. Nagrebetskii}, title = {Invariant coverings of subgroups}, journal = {Doklady Akademii Nauk}, pages = {30--32}, publisher = {mathdoc}, volume = {172}, number = {1}, year = {1967}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1967_172_1_a6/} }
V. T. Nagrebetskii. Invariant coverings of subgroups. Doklady Akademii Nauk, Tome 172 (1967) no. 1, pp. 30-32. http://geodesic.mathdoc.fr/item/DAN_1967_172_1_a6/