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Translated from Matematicheskie Zametki, Vol. 27, No. 1, pp. 61–75, January, 1980.
In conclusion, the author thanks V. I. Ruban for his useful discussions.
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Ligun, A.A. Diameters of certain classes of differentiate periodic functions. Mathematical Notes of the Academy of Sciences of the USSR 27, 34–41 (1980). https://doi.org/10.1007/BF01149811
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DOI: https://doi.org/10.1007/BF01149811