中文摘要：

采用Krasnoselskii不动点定理证明了带可积时滞的非线性中立型微分方程周期解的存在性.并推广了Dib和Maroun的结论.

英文摘要：

It used a variant of Krasnoselskii＇s fixed point theorem to show the existence of periodic solutions for nonlinear neutral differential equations with functional delay. The results were obtained by generalizing previous results of Dib and Maroun. An example was given to illustrate the results.