About author:ZHANG Hai-hui(1979-), male, native of Taixing, Jiangsu, a lecturer of Huaiyin Teacher’s College,
M.S.D., engages in graph theory.
Supported by:
Supported by the Natural Science Research Project of Ordinary Universities in Jiangsu(08KJB110002); Supported by the Program for ETHYTC(08QNZCK03); Supported by the NSFC(10671095);