In this paper ,using Mawhin's coincidence degree theory.we obtain existence results concerning T-periodic solutions of fourth-order differential equations of the type u(4)（t)-pu(2)(t)-h(u(1)(t)）-g(u(t-v(t))=e(t)
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曾力. 一类四阶非线性泛函微分方程的周期解[J]. 科学技术与工程, 2010, (2): . zengli. Periodic solutions of some fourth-order nonlinear functions differential equations[J]. Science Technology and Engineering,2010,(2).
