References

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  5. Vel'hach A.V. Asymptotic properties of solutions of systems of nonlinear functional differential equations of neutral type. Nonlinear Oscil. 2009, 12 (1), 19-26. doi: 10.1007/s11072-009-0056-6 (translation of Neliniini Koliv. 2009, 12 (1), 20-26. (in Ukrainian))