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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 50, No. 4, p. 599, April, 1998.
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Samoilenko, A.M., Kolomiets, V.G. & Samoilenko, V.G. The Third Bogolyubov Readings. International Scientific Conference “Asymptotic and Qualitative Methods in the Theory of Nonlinear Oscillations”. Ukr Math J 50, 680–681 (1998). https://doi.org/10.1007/BF02487400
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DOI: https://doi.org/10.1007/BF02487400