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On periodic solutions of second-order differential equations with attractive-repulsive singularities
- 1.HAKL, Robert, TORRES, P.J. On periodic solutions of second-order differential equations with attractive-repulsive singularities. Journal of Differential Equations. 2010, 248(1), 111-126. ISSN 0022-0396. E-ISSN 1090-2732. Available: doi: 10.1016/j.jde.2009.07.008.
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