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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 39, No. 3, pp. 299–303, May–June, 1987.
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Zavalykut, G.D., Nurzhanov, O.D. A periodic boundary-value problem for a class of differential-operator equations. Ukr Math J 39, 228–232 (1987). https://doi.org/10.1007/BF01057223
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DOI: https://doi.org/10.1007/BF01057223