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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 36, No. 3, pp. 327–335, May–June, 1984.
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Pak, I.N. Differentiability of sums of the series that contain solutions of a Sturm-Liouville-type differential equation. Ukr Math J 36, 293–301 (1984). https://doi.org/10.1007/BF01077464
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DOI: https://doi.org/10.1007/BF01077464