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Review/Citation:  HAKL, Robert, TORRES, P.J., ZAMORA, M. Periodic solutions of singular second order differential equations : upper and lower functions. Nonlinear Analysis: Theory, Methods & Applications. 2011, 74(18), 7078-7093. ISSN 0362-546X. E-ISSN 1873-5215
Requested document:  Hakl.pdf - Publisher’s postprint
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