1. N. P. Korneichuk, Extremal Problems of the Theory of Approximations [in Russian], Nauka, Moscow (1976).
2. D. J. Newman and T. J. Rivlin, ?Approximation of monomials by lower degree polynomials,? Aeguat. Math.,14, No. 3, 451?455 (1976).
3. R. Bellman, Introduction to the Theory of Matrices [Russian translation], Nauka, Moscow (1969).
4. S. G. Mikhlin, Linear Integral Equations, Hindustan Publ. Corp., Delhi (1960).
5. N. I. Akhiezer, Lectures on Approximation Theory [in Russian], Nauka, Moscow (1965).