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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 40, No. 6, pp. 757–763, November–December, 1988.
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Mitropol'skii, Y.A., Khoma, G.P. Periodic solutions of second-order wave equations. IV. Ukr Math J 40, 639–644 (1988). https://doi.org/10.1007/BF01057183
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DOI: https://doi.org/10.1007/BF01057183