Periodic Solutions of Equations of Emarkov-Pinney Type

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Periodic solutions of second order non-autonomous singular dynamical systems (2007, background): “Here we remark that, even in the scalar case, the existence of periodic solutions for singular problems has commanded much attention in recent years [4,6,7,9,13,20,31].”
Applications of Schauder's fixed point theorem to singular differential equations (2007, methodology): “J. Mawhin, ‘Topological degree and boundary value problems for nonlinear differential equations’, Topological methods for ordinary differential equations, ed.”