In this paper,the existence of periodic solutions for autonomous planar systemsis studied and sufficient conditions for the existence of non-zero periodic solutions of this kind areobtained.Some known results are extended and improved.
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杨启贵,张谋.平面自治系统的周期解的存在性[J].土木与环境工程学报(中英文),1995,17(1). Yang Qigui, Zhang Mou. EXISTENCE OF PERIONDIC SOLUTIONS FOR AUTONOMOUS PLANAR SYSTEMS[J]. JOURNAL OF CIVIL AND ENVIRONMENTAL ENGINEERING,1995,17(1).10.11835/j. issn.1674-4764.1995.01.005