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Additional information
Moscow State University. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 1, No. 1, pp. 75–85, January–March, 1967.
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Katok, A.B. Entropy and approximations of dynamical systems by periodic transformations. Funct Anal Its Appl 1, 66–74 (1967). https://doi.org/10.1007/BF01075867
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DOI: https://doi.org/10.1007/BF01075867