Geodesic
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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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/

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[11] Dzhrbashyan M. M., “Ob odnom novom integralnom preobrazovanii i ego primenenii v teorii tselykh funktsii”, Dokl. AN SSSR, 95 (1954), 1133–1136 ; Изв. АН СССР. Сер. матем., 19:2 (1955), 133–190 | Zbl | MR | Zbl

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