Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DE_2002_38_11_a10, author = {V. N. Chetverikov}, title = {Higher {Symmetries} and the {Brunovskii} {Infinitesimal} {Form} of {Controlled} {Systems}}, journal = {Differencialʹnye uravneni\^a}, pages = {1525--1532}, publisher = {mathdoc}, volume = {38}, number = {11}, year = {2002}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_2002_38_11_a10/} }
V. N. Chetverikov. Higher Symmetries and the Brunovskii Infinitesimal Form of Controlled Systems. Differencialʹnye uravneniâ, Tome 38 (2002) no. 11, pp. 1525-1532. http://geodesic.mathdoc.fr/item/DE_2002_38_11_a10/