@article{ZVMMF_1962_2_3_a7,
     author = {A. A. Letichevskii},
     title = {Automatic expansion of representations of free semigroups},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {467--474},
     publisher = {mathdoc},
     volume = {2},
     number = {3},
     year = {1962},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1962_2_3_a7/}
}