Geodesic
A problem of Shannon
Doklady Akademii Nauk, Tome 215 (1974) no. 6, pp. 1313-1316 
L. B. Sofman. A problem of Shannon. Doklady Akademii Nauk, Tome 215 (1974) no. 6, pp. 1313-1316. http://geodesic.mathdoc.fr/item/DAN_1974_215_6_a8/
@article{DAN_1974_215_6_a8,
     author = {L. B. Sofman},
     title = {A problem of {Shannon}},
     journal = {Doklady Akademii Nauk},
     pages = {1313--1316},
     year = {1974},
     volume = {215},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1974_215_6_a8/}
}
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