@article{TVP_1979_24_1_a20,
     author = {L. A. Grigorenko},
     title = {On the $\sigma$-algebra of symmetrical events for a countable {Markov} chain},
     journal = {Teori\^a vero\^atnostej i ee primeneni\^a},
     pages = {198--204},
     publisher = {mathdoc},
     volume = {24},
     number = {1},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TVP_1979_24_1_a20/}
}