%0 Journal Article %A R. Z. Khas'minskii %T Principle of Averaging for Parabolic and Elliptic Differential Equations and for Markov Processes with Small Diffusion %J Teoriâ veroâtnostej i ee primeneniâ %D 1963 %P 3-25 %V 8 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/TVP_1963_8_1_a0/ %G ru %F TVP_1963_8_1_a0