A New Existence Theory for Positive Periodic Solutions to Volterra Integro differential Equations
Volterra积分微分方程周期正解的一个新的存在性理论

This paper deals with a new existence theory for positive periodic solutions to a kind of nonautonomous Volterra integro-differential equations by employing a fixed point theorem in cones. Applying the general theorems established to several biomathematical models, the paper improves some previous results and obtains some new results.