中国科学院数学与系统科学研究院期刊网
The Index and Connection of Isolated Invariant Sets of a Class Ecological Systems
Zuo Huan ZHENG(1),Cheng Dong Z
Acta Mathematica Sinica, Chinese Series . 2000, (5): 937 -946 .  DOI: 10.12386/A2000sxxb0121