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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 29, No. 3, pp. 398–404, May–June, 1977.
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Mitropol'skii, Y.A., Lan, N.K. Oscillations of a system with lag depending on the system's state. Ukr Math J 29, 304–309 (1977). https://doi.org/10.1007/BF01104482
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DOI: https://doi.org/10.1007/BF01104482