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Translated from Matematicheskie Zametki, Vol. 35, No. 3, pp. 369–380, March, 1984.
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Konovalov, V.N. Estimates of Kolmogorov-type widths for classes of differentiable periodic functions. Mathematical Notes of the Academy of Sciences of the USSR 35, 193–199 (1984). https://doi.org/10.1007/BF01139916
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DOI: https://doi.org/10.1007/BF01139916