ermanence and Global Stability for Single-species Model with Three Life Stages and Time Delay
具有三个成长阶段的单种群时滞模型的永久持续生存和全局稳定性

In this paper,a single-species model with distributed time delay in which individuals exhibit three life stages is considered.Sufficient conditions are obtained for the permanence of the system.Moreover,by using Lyapunov function,some conditions for global asymptotic stability of the system are investigated.An example satisfying the conditions of the main resuilts is given.