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2. E. Ya. Remez, Fundamentals of Numerical Methods of Chebyshev Approximations [in Russian], Naukova Dumka, Kyiv (1969).
3. I. P. Natanson, Constructive Theory of Functions [in Russian], Gostekhizdat, Moscow–Leningrad (1949).
4. N. I. Akhiezer, Lectures on the Theory of Approximation [in Russian], Nauka, Moscow (1965).
5. S. B. Stechkin and Yu. N. Subbotin, Splines in Computational Mathematics [in Russian], Nauka, Moscow (1976).