@article{MZM_1977_21_3_a2,
     author = {A. P. Cherenkov},
     title = {Attainability property and ergodicity theorems for {a~semi-Markov} process with an arbitrary set of states},
     journal = {Matemati\v{c}eskie zametki},
     pages = {301--312},
     publisher = {mathdoc},
     volume = {21},
     number = {3},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1977_21_3_a2/}
}