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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 32, No. 2, pp. 244–248, March–April, 1980.
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Ponomarev, A.S. Almost-periodic oscillations in double-tuned damped system. Ukr Math J 32, 155–158 (1980). https://doi.org/10.1007/BF01092794
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DOI: https://doi.org/10.1007/BF01092794