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Translated from Ukrainskii Matematicheskii Zhurnal, Vol.21, No.4, pp. 511–521, July–August, 1969.
The author expresses his sincere gratitude to V. K. Dzyadyk and to P. I. Tatsunyak for useful comments.
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Yatsun, V.A. Analytic continuation of expansions in Jacobi polynomials. Ukr Math J 21, 436–444 (1969). https://doi.org/10.1007/BF01090784
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DOI: https://doi.org/10.1007/BF01090784