@article{TVP_1968_13_3_a13,
     author = {V. M. Ashurov},
     title = {On filtration of {Markov} chains on a~finite group},
     journal = {Teori\^a vero\^atnostej i ee primeneni\^a},
     pages = {517--522},
     year = {1968},
     volume = {13},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TVP_1968_13_3_a13/}
}