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Translated from Ukrainskii Matematicheskii Zhurnal. Vol. 29, No. 3, pp. 389–392, May–June, 1977.
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Krasnov, V.A., Fokht, A.S. An interpolation theorem for sums of Legendre functions and its application. Ukr Math J 29, 297–299 (1977). https://doi.org/10.1007/BF01104480
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DOI: https://doi.org/10.1007/BF01104480