%0 Journal Article %A A. V. Greshnov %T Proof of Gromov's theorem on homogeneous nilpotent approximation for vector fields of class~$C^1$ %J Matematičeskie trudy %D 2012 %P 72-88 %V 15 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/MT_2012_15_2_a3/ %G ru %F MT_2012_15_2_a3