@article{DM_2013_25_3_a5,
     author = {A. A. Petushko},
     title = {On bigram languages},
     journal = {Diskretnaya Matematika},
     pages = {64--77},
     publisher = {mathdoc},
     volume = {25},
     number = {3},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DM_2013_25_3_a5/}
}