中国科学院数学与系统科学研究院期刊网
AMS
Homoclinic and Periodic Orbits Arising Near the Heteroclinic Cycle Connecting Saddle-focus and Saddle Under Reversible Condition
De Ming ZHU, Ying SUN
Acta Mathematica Sinica . 2007, (8): 1495 -1504 .  DOI: 10.1007/s10114-005-0746-7