@article{DAN_1968_179_6_a9,
     author = {G. V. Chudnovskii},
     title = {Some results in the theory of infinitely long expressions},
     journal = {Doklady Akademii Nauk},
     pages = {1286--1288},
     year = {1968},
     volume = {179},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1968_179_6_a9/}
}