一类四次扰动Liénard系统的极限环分支
朱红英,韦敏志,杨素敏,蒋曹清

Bifurcation of Limit Cycles from a Liénard System of Degree 4
Hongying Zhu,Minzhi Wei,Sumin Yang,Caoqing Jiang
图 1 系统$ (1.5)_{\varepsilon = 0} $的相图