›› 2008, Vol. 25 ›› Issue (4): 433-438.DOI: 10.7523/j.issn.2095-6134.2008.4.001
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Fan ling-ling, Wang shu-guang, Guo tian-de
1 School of Mathematical Sciences, Graduate University of the Chinese Academy of Sciences, Beijing 100049, China;
2 Institute of Automation of the Chinese Academy of Sciences, Beijing 100080, China