Sewell, W.E. Degree of approximation by polinomials in the complex domain / by W.E. Sewell. - Princeton, N.J. : Princeton University Press Oxford University Press, 1942. - IX, 236 p. : fig. ; 23 cm. - Annals of mathematics studies N. 9 . Bibl. pp. 226-236 Subjects--Topical Terms: ApproximationPolynomials