Geodesic
Some properties of Shannon functions
Matematičeskie zametki, Tome 8 (1970) no. 5, pp. 663-674.

Voir la notice de l'article provenant de la source Math-Net.Ru

Necessary and sufficient conditions are derived for an arbitrary numerical function to be equivalent to some Shannon function. 
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     author = {N. A. Karpova},
     title = {Some properties of {Shannon} functions},
     journal = {Matemati\v{c}eskie zametki},
     pages = {663--674},
     publisher = {mathdoc},
     volume = {8},
     number = {5},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1970_8_5_a13/}
}
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N. A. Karpova. Some properties of Shannon functions. Matematičeskie zametki, Tome 8 (1970) no. 5, pp. 663-674. http://geodesic.mathdoc.fr/item/MZM_1970_8_5_a13/