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Degree Kirchhoff Index of Bicyclic Graphs
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- Journal:
- Canadian Mathematical Bulletin / Volume 60 / Issue 1 / 01 March 2017
- Published online by Cambridge University Press:
- 20 November 2018, pp. 197-205
- Print publication:
- 01 March 2017
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- Article
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Let
$G$ be a connected graph with vertex set 
$V\left( G \right)$ .The degree Kirchhoff index of $G$ is defined as 
${{S}^{\prime }}\left( G \right)\,=\,\sum{_{\left\{ u,v \right\}\,\subseteq \,V\left( G \right)}d\left( u \right)d\left( v \right)R\left( u,\,v \right)}$ , where 
$d\left( u \right)$ is the degree of vertex 
$u$ , and 
$R\left( u,\,v \right)$ denotes the resistance distance between vertices $u$ and 
$v$ . In this paper, we characterize the graphs having maximum and minimum degree Kirchhoff index among all 
$n$ -vertex bicyclic graphs with exactly two cycles.
