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G. Faber, Über polynomische Entwickelungen, Math. Ann. 57 (1903), 389-408. MR 1511216

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D. Jackson, The theory of approximation, Amer. Math. Soc. Colloq. Publ. Vol. 11, Amer. Math. Soc., Providence, R. I., 1930. MR 1451140 (98a:01022)

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W. Sewell, Degree of approximation by polynomials to continuous functions, Bull. Amer. Math. Soc. 41 (1935), 111-117. MR 1563032

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E. Whittaker and G. Watson, A course of modern analysis, Cambridge University Press, New York, 1950. MR 1424469 (97k:01072)