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[期刊论文] 作者：Wei Hua HE,Jun LUO,Chao YANG,Wei YUAN,Hui Chun ZHANG,
来源：数学学报（英文版） 年份：2021
Lin-Lu-Yau introduced a notion of Ricci curvature for graphs and obtained a complete classification for all Ricci-flat graphs with girth at least five.In this paper,we characterize all Ricci-flat graphs of girth four with vertex-disjoint 4-......
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