Periodic solutions of fourth-order delay differential equation

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In this paper the periodic solutions of fourth order delay differential equation of the form $ddddot{x}(t)+adddot{x}(t)+f(ddot{x}(t-tau(t)))+g(dot{x}(t-tau(t)))+h({x}(t-tau(t)))=p(t)$  is investigated. Some new positive periodic criteria are given.  

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Journal title

volume 41  issue 2

pages  307- 314

publication date 2015-04-01

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