中国科学院数学与系统科学研究院期刊网
Bifurcation of Limit Cycles from the Center of Quadratic Reversible System (r6) with non-Morsean Point
Shi You SUI, Wei Jiao XU
Acta Mathematica Sinica, Chinese Series . 2021, (6): 999 -1004 .  DOI: 10.12386/A2021sxxb0083