%0 Journal Article %A Yu. K. Belyaev %T On the number of boundary out-crossings of a region by a vector stochastic process %J Teoriâ veroâtnostej i ee primeneniâ %D 1968 %P 333-337 %V 13 %N 2 %U http://geodesic.mathdoc.fr/item/TVP_1968_13_2_a10/ %G ru %F TVP_1968_13_2_a10