具有二阶细焦点的二次系统极限环的唯一性

陈文成;张平光

ON THE UNIQUENESS OF THE LIMIT CYCLE OF THE QUADRATIC SYSTEM WITH A WEAK FOCUS OF ORDER 2

CHEN WEN-CHENG;ZHANG PIN-GUANG

系统科学与数学 . 1991, (3): 217 -226 . DOI: 10.12341/jssms08644