Integral representations and best approximation by generalized polynomials in systems of Mittag-Leffler type
Izvestiya. Mathematics , Tome 23 (1984) no. 3, pp. 449-471

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Integral representations are established for generalized polynomials in certain systems of functions of Mittag-Leffler type, and a theorem is proved on the analytic continuation of functions with a sufficiently high degree of approximation by such polynomials. Bibliography: 15 titles.
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     title = {Integral representations and best approximation by generalized polynomials in systems of {Mittag-Leffler} type},
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M. M. Dzhrbashyan; V. M. Martirosyan. Integral representations and best approximation by generalized polynomials in systems of Mittag-Leffler type. Izvestiya. Mathematics , Tome 23 (1984) no. 3, pp. 449-471. http://geodesic.mathdoc.fr/item/IM2_1984_23_3_a2/