Unique Existence of Solution to Boundary Value Problem of Li\''{E}Nard Type Equations
Li\''{e}nard 型方程周期边值问题 解的存在唯一性

In this paper the unique solvability of the periodic solution to the following boundary value problem $$u'(t)+f(u,t)u'(t)+g(u,t)=e(t)$$ with suitable periodic boundary conditions is considered.