%0 Journal Article %A A. Yu. Veretennikov %T On~rate of mixing and the averaging principle for hypoelliptic stochastic differential equations %J Izvestiya. Mathematics %D 1989 %P 221-231 %V 33 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/IM2_1989_33_2_a0/ %G en %F IM2_1989_33_2_a0