%0 Journal Article %A T. L. Shervashidze %A A. A. Novikov %T XX Winter School on Probability Theory and Mathematical Statistics %J Teoriâ veroâtnostej i ee primeneniâ %D 1987 %P 822-823 %V 32 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/TVP_1987_32_4_a27/ %G ru %F TVP_1987_32_4_a27