Existence of Positive Periodic Solutions for Non-Autonomous Functional Differential Equations

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Positive periodic solutions of functional differential equations (2004, result): “When g 1; some related results for similar problems were shown in [1,9,10,17,20] based on the fixed point theorem.”
Positive Solutions of Three-Point Nonlinear Second Order Boundary Value Problem (2002, background): “For some appropriate references we refer the reader to [1], [2], [3], [4], [5], [6], [8], [9], [12], [13], [14], [15], [16] and the references therein.”
Positive periodic solutions of nonautonomous functional differential equations depending on a parameter (2002, unknown): “[1, 2, 3, 4, 6, 7] and the references therein).”
Periodic solutions for scalar functional differential equations (2005, background): “For example, Cheng and Zhang [1] and Wang [20] investigate the existence of positive periodic solution of the following two scalar delay differential equations: y′(t)=−a(t)y(t)+ h(t)f (y(t − (t))), y′(t)= a(t)y(t)− h(t)f (t − (t))), which are clearly special cases of (1.”
Periodic solutions of functional dynamic equations with infinite delay (2008, methodology): “, differential equations [6, 15, 17, 19, 22, 23, 24], difference equations [10, 14, 16, 18, 25]).”