Academic Editor: Claudianor O. Alves
Copyright © 2011 Shunjun Jiang et al. This is an open access article distributed under the
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We study the following second-order differential equation: , where (), and are positive constants, and satisfies . Under some assumptions on the parities of and , by a small twist theorem of reversible mapping we obtain the existence of quasiperiodic solutions and boundedness of all the solutions.