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@article{DAN_1987_295_4_a0, author = {A. A. Agrachev and A. V. Sarychev}, title = {Filtrations of a {Lie} algebra of vector fields and the nilpotent}, journal = {Doklady Akademii Nauk}, pages = {777--781}, publisher = {mathdoc}, volume = {295}, number = {4}, year = {1987}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1987_295_4_a0/} }
A. A. Agrachev; A. V. Sarychev. Filtrations of a Lie algebra of vector fields and the nilpotent. Doklady Akademii Nauk, Tome 295 (1987) no. 4, pp. 777-781. http://geodesic.mathdoc.fr/item/DAN_1987_295_4_a0/