Voir la notice de l'article provenant de la source Math-Net.Ru
@article{MZM_1968_4_6_a1, author = {V. M. Kotlov}, title = {On varieties of $n$-solvable groups}, journal = {Matemati\v{c}eskie zametki}, pages = {629--634}, publisher = {mathdoc}, volume = {4}, number = {6}, year = {1968}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1968_4_6_a1/} }
V. M. Kotlov. On varieties of $n$-solvable groups. Matematičeskie zametki, Tome 4 (1968) no. 6, pp. 629-634. http://geodesic.mathdoc.fr/item/MZM_1968_4_6_a1/