@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/}
}