@article{DAN_1969_186_6_a1,
     author = {Yu. K. Belyaev},
     title = {The number of entries of the trajectories of a {Markov} process into a given set in phase space},
     journal = {Doklady Akademii Nauk},
     pages = {1243--1245},
     publisher = {mathdoc},
     volume = {186},
     number = {6},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1969_186_6_a1/}
}