Geodesic
On the common-neighborhood energy of a graph
Bulletin de l'Académie serbe des sciences. Classe des sciences mathématiques et naturelles, Tome 36 (2011) no. 1 Cet article a éte moissonné depuis la source eLibrary of Mathematical Institute of the Serbian Academy of Sciences and Arts

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We introduce the concept of common-neighborhood energy $E_{CN}$ of a graph $G$ and obtain an upper bound for $E_{CN}$ when $G$ is strongly regular. We also show that $E_{CN}$ of several classes of graphs is less than the common-neighborhood energy of the complete graph $K_n$\,. 
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     author = {A. Alwardi and N. D. Soner and I. Gutman},
     title = {On the common-neighborhood energy of a graph},
     journal = {Bulletin de l'Acad\'emie serbe des sciences. Classe des sciences math\'ematiques et naturelles},
     pages = {49 - 59},
     year = {2011},
     volume = {36},
     number = {1},
     url = {http://geodesic.mathdoc.fr/item/BASS_2011_36_1_a3/}
}
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A. Alwardi; N. D. Soner; I. Gutman. On the common-neighborhood energy of a graph. Bulletin de l'Académie serbe des sciences. Classe des sciences mathématiques et naturelles, Tome 36 (2011) no. 1. http://geodesic.mathdoc.fr/item/BASS_2011_36_1_a3/