中国科学院数学与系统科学研究院期刊网
GLOBAL BIFURCATION AND CHAOTIC BEHAVIOR IN A DISTURBED QUADRATIC SYSTEM WITH TWO CENTERS
Li Ji-bin, Ou Yue-hua
Acta Mathematicae Applicatae Sinica . 1988, (3): 312 -323 .  DOI: 10.12387/C1988034