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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 38, No. 6, pp. 733–739, November–December, 1986.
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Mitropol'skii, Y.A., Khoma, G.P. Periodic solutions of second-order wave equations. II. Ukr Math J 38, 617–623 (1986). https://doi.org/10.1007/BF01056646
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DOI: https://doi.org/10.1007/BF01056646