J4 ›› 2011, Vol. 46 ›› Issue (3): 35-40.
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WANG Yang1, ZHANG Guan-yu2, ZHANG Li3
- 1. Department of Computer Science, Huanghuai University, Zhumadian 463000, Henan, China;
2. Department of Mathematics Science, Huanghuai University, Zhumadian 463000, Henan, China;
3. School of Mathematics, Shandong University, Jinan 250100, Shandong, China
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Received:2010-06-06
Published:2011-04-21
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