%0 Journal Article %A Yu. K. Belyaev %T The number of entries of the trajectories of a Markov process into a given set in phase space %J Doklady Akademii Nauk %D 1969 %P 1243-1245 %V 186 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1969_186_6_a1/ %G ru %F DAN_1969_186_6_a1