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【摘 要】
：
Let K be the quasi-Laplacian matrix of a graph G and B be the adjacency matrix of the line graph of G, respectively. In this paper, we first present two sharp u
【机 构】
：
Department of Mathematics
【出 处】
：
中国科学A辑（英文版）
【发表日期】
：
2004年期
【基金项目】
：
四川省自然科学基金
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