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【摘 要】
：
It has been known that determining the exact value of vertex distinguishing edge index χ's (G) of a graph G is difficult, even for simple classes of graphs
【机 构】
：
CollegeofMathematicsandStatistics,DepartmentofMathematicsandStatisticsofGeorgiaStateUniversity
【出 处】
：
数学物理学报：B辑英文版
【发表日期】
：
2013年3期
【基金项目】
：
The first author is supported by the National Natural Science Foundation of China （61163054）, the second author is supported by the National Natural Science Foundation of China （61163037）.
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