J4 ›› 2011, Vol. 37 ›› Issue (1): 138-141.

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 HAN YA-Kun1, BI Chong-Cai2, ZHANG Yu-Feng3, ZHANG Ying-Li1   

  • Received:2010-06-23 Online:2011-01-28 Published:2011-01-28

CLC Number: 

  • R781