Literature cited
A. A. Zhensykbaev, “Sharp estimates of the uniform approximation of periodic continuous functions by splines of order r,” Mat. Zametki,13, No. 2, 217–228 (1973).
Yu. S. Zav'yalov, B. I. Kvasov, and V. L. Miroshpichenko, Methods of Spline Functions [in Russian], Nauka, Moscow (1980).
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Translated from Matematicheskie Zametki, Vol. 42, No. 1, pp. 9–20, July, 1987.
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Ismagulov, M.R. Sharp estimates of approximation of periodic continuous functions by regular splines. Mathematical Notes of the Academy of Sciences of the USSR 42, 516–522 (1987). https://doi.org/10.1007/BF01138719
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DOI: https://doi.org/10.1007/BF01138719