Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1960_134_3_a8, author = {Ya. D. Polovitskii}, title = {Layerwise extremal groups}, journal = {Doklady Akademii Nauk}, pages = {533--535}, publisher = {mathdoc}, volume = {134}, number = {3}, year = {1960}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1960_134_3_a8/} }
Ya. D. Polovitskii. Layerwise extremal groups. Doklady Akademii Nauk, Tome 134 (1960) no. 3, pp. 533-535. http://geodesic.mathdoc.fr/item/DAN_1960_134_3_a8/