（Dept. of Math.,Zaozhuang College,Zaozhuang 277160,Shandong China）
Online:2008-01-25
Published:2012-05-26
About author:WANG Bing(1971-),female,was born in Wuhu City,Anhui Province,associate professor of Zaozhuang College,master;research area is theory of graph.
Supported by:
National Natural Science Foundation of China (10471078)
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