J4 ›› 2011, Vol. 46 ›› Issue (3): 46-51.
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LI Yu-ying1,2, LIN Hong-kang1,2
- 1. Department of Computer and Information Engineering, Ningde Normal University, Ningde 352100, Fujian, China;
2. School of Mathematics, Shandong University, Jinan 250100, Shandong, China
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Received:
2010-10-05
Published:
2011-04-21
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