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On periodic solutions of two-dimensional nonautonomous differential systems
- 1.Kiguradze, I., Mukhigulashvili, S. On periodic solutions of two-dimensional nonautonomous differential systems. Nonlinear Analysis: Theory, Methods & Applications. 2005, 60(2), 241-256. ISSN 0362-546X. E-ISSN 1873-5215.
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