%0 Journal Article %A V. N. Chetverikov %T Higher Symmetries and the Brunovskii Infinitesimal Form of Controlled Systems %J Differencialʹnye uravneniâ %D 2002 %P 1525-1532 %V 38 %N 11 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_2002_38_11_a10/ %G ru %F DE_2002_38_11_a10