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Review/Citation: HAKL, Robert, TORRES, P.J., ZAMORA, M. Periodic solutions to singular second order differential equations: the repulsive case. Topological Methods in Nonlinear Analysis. 2012, 39(2), 199-220. ISSN 1230-3429. E-ISSN 1230-3429.
Requested document: Hakl4.pdf - Author´s preprint
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