Geodesic
Some properties of $A$-entropy
Matematičeskie zametki, Tome 5 (1969) no. 3, pp. 327-334.

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The connection of $A$-entropy $h_A(T)$ with the spectrum $T$ of a dynamical system is considered. It is found that $\sup\limits_{\{a\}}h_A(T)$ assumes the value $\infty$ or the $\log k$ value where $k$ is a natural number. 
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     author = {B. S. Pitskel'},
     title = {Some properties of $A$-entropy},
     journal = {Matemati\v{c}eskie zametki},
     pages = {327--334},
     publisher = {mathdoc},
     volume = {5},
     number = {3},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1969_5_3_a6/}
}
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B. S. Pitskel'. Some properties of $A$-entropy. Matematičeskie zametki, Tome 5 (1969) no. 3, pp. 327-334. http://geodesic.mathdoc.fr/item/MZM_1969_5_3_a6/