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2. Atkinson, K.: An Introduction to Numerical Analysis, 2nd edn. John Wiley & Sons, New York (1989)
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4. Bernstein, S.N.: On quadrature formulas with positive coefficients. Izv. Akad. Nauk. SSSR, Ser. Mat. 1(4), 479–503 (1937, Russian)
5. Bernstein, S.N.: Sur un système d’équations indéterminées. J. Math. Pures Appl. 17(9), 179–186 (1938)