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[期刊论文] 作者:MIAO ZHENGKE,ZHANG KEMIN,
来源:数学年刊B辑(英文版) 年份:2004
Let D = (V,E) be a primitive digraph. The exponent of D, denoted by γ(D), is the least integer k such that for any u, v ∈ V there is a directed walk of length...
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