@article{DAN_1961_139_3_a11,
     author = {Al. A. Markov},
     title = {Alphabetic coding},
     journal = {Doklady Akademii Nauk},
     pages = {560--561},
     publisher = {mathdoc},
     volume = {139},
     number = {3},
     year = {1961},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1961_139_3_a11/}
}