We establish sufficient conditions for the existence of periodic solutions for systems of nonlinear functional-differential equations with deviations of the argument and a small parameter ε. We also study the properties of these solutions as ε → 0.
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Translated from Neliniini Kolyvannya, Vol. 19, No. 2, pp. 181–202, April–June, 2016.
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Denysenko, N.L. Periodic Solutions and Their Properties for Systems of Functional-Differential Equations with Parameter. J Math Sci 223, 232–256 (2017). https://doi.org/10.1007/s10958-017-3351-2
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DOI: https://doi.org/10.1007/s10958-017-3351-2