J4 ›› 2010, Vol. 45 ›› Issue (5): 74-77.

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SONG Ying, ZHANG Xing-fang   

  1. School of Mathematics Science, Liaocheng University, Liaocheng  252059, Shandong, China
  • Received:2009-03-30 Online:2010-05-16 Published:2010-05-24
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