Literature cited
A. F. Timan, Theory of Approximation of Functions of a Real Variable [in Russian], Fizmatgiz, Moscow (1960).
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Translated from Matematicheskie Zametki, Vol. 41, No. 4, pp. 517–520, April, 1987.
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Petukhov, A.P. Estimates of the derivatives of trigonometric polynomials. Mathematical Notes of the Academy of Sciences of the USSR 41, 291–293 (1987). https://doi.org/10.1007/BF01137675
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DOI: https://doi.org/10.1007/BF01137675