New results on almost periodic solutions for a class of nonlinear Duffing equations with a deviating argument.

Qiyuan Zhou Bingwen Liu New results on almost periodic solutions for a class of nonlinear Duffing equations with a deviating argument. 6-11 2009 22 Appl. Math. Lett. 1 http://dx.doi.org/10.1016/j.aml.2007.10.002 db/journals/appml/appml22.html#ZhouL09