ON LIMIT CYCLES OF PLANAR QUADRATIC SYSTEM
摘要
Let a quadratic system of differential equations (E_2) possess a focus of order 3 and a uniquesimple singular point at infinity. Then it possesses another focus with odd number of limit cyclesaround it. By suitable variations of the coefficients of the system,three limit cycles jump out ofthe focus of order 3 so that there exist at least four limit cycles for (E_2), and the global structureis completely determined.
引用本文（GB/T 7714）
Qin Yue, Suo G, DU Xiu-li. ON LIMIT CYCLES OF PLANAR QUADRATIC SYSTEM[J]. 未知来源, 1982.
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