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- [6] Existence of positive periodic solutions of functional differential equations CDDEA '06: PROCEEDINGS OF THE CONFERENCE ON DIFFERENTIAL AND DIFFERENCE EQUATIONS AND APPLICATIONS 2006, 2007, 38 : 77 - 88
- [7] Three Positive Periodic Solutions of Nonlinear Functional Differential Equations with Impulse Effects MEMS, NANO AND SMART SYSTEMS, PTS 1-6, 2012, 403-408 : 1319 - 1321