中文摘要：

通过构造差分方程的伪概周期序列解,研究了一类三阶含逐段常变量微分方程伪概周期解的存在性.

英文摘要：

In this paper, we present some existence theorems for pseudo almost periodic solutions of third order differential equations with piecewise constant argument by means of pseudo almost periodic solutions of relevant difference equations.