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@article{DAN_1974_215_6_a8, author = {L. B. Sofman}, title = {A problem of {Shannon}}, journal = {Doklady Akademii Nauk}, pages = {1313--1316}, publisher = {mathdoc}, volume = {215}, number = {6}, year = {1974}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1974_215_6_a8/} }
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/