Chinese Journal of Nature ›› 2008, Vol. 30 ›› Issue (4): 199-204.
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LIU De-lin; DENG Ke; GENG Zhi; LIU Jun; LIANG Ju-sheng
1、5 China Academy of Chinese Medical Sciences, Beijing 100700, china;2 Ph.D. Candidate, 3 School of Mathematical Sciences, peking University, Beijing 100871, China,4 Harvard University,MA02138, USA; Peking University, Beijing 100871, China