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  periodic solutions of radially symmetric systems with a singular      

Boundary Value Problems 2013:110

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Periodic solutions of radially symmetric systems with a singularity
S Li, F Liao, J Sun - Boundary Value Problems, 2013 - Springer
Abstract In this paper, we study the existence of infinitely many periodic solutions to planar radially
symmetric systems with certain strong repulsive singularities near the origin and with some semilinear
growth near infinity. The proof of the main result relies on topological degree theory. ...
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