Existence and Uniqueness of Periodic Solutions for a Kind of Lienard-Type Equations with a Deviating Argument
一类具偏差变元的Lienard型方程周期解的存在与惟一性

In this paper, by using the coincidence degree theory, new results are obtained for the existence and uniqueness of periodic solutions of the following Lienard-type equation with a deviating argument:x'(t)+f(x(t))x'(t)+g(t,x(t-\tau(t)))=p(t). Some existing related results in the literature are improved and extended.