@article{DAN_1973_211_4_a2,
     author = {R. R. Varshamov},
     title = {Operator substitutions in a {Galois} field and their application},
     journal = {Doklady Akademii Nauk},
     pages = {768--771},
     publisher = {mathdoc},
     volume = {211},
     number = {4},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1973_211_4_a2/}
}