Acta mathematica scientia,Series A ›› 2000, Vol. 20 ›› Issue (1): 85-94.
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(Whuhan Institute of Physics and Mathematics, The Chinese Academy of Sciences, Wuhan 430071)
(Department of Systems Sciences, Beijing Normal University, Beijing 100875)
(Whuhan Institute of Physics and Mathematics, The Chinese Academy of Sciences, Wuhan 430071)