利用重合度理论中的延拓定理研究带有开发利用项的具有 Holling III 型功能性反应的捕食者-食饵系统,得到了两个正周期解存在的充分条件,得到了一些新的结果% By using the coincidence degree theory, we investigate the existence of positive periodic solutions of predator-prey system with Holling III functional response and exploited terms. Some new criteria are established for the existence of periodic solutions.
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