Geodesic
On hyper-Zagreb index and coindex
Bulletin de l'Académie serbe des sciences. Classe des sciences mathématiques et naturelles, Tome 42 (2017), p. 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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Let $G$ be a graph with vertex set $\mathbf V$ and edges set $\mathbf E$. By $d(v)$ is denoted the degree of its vertex $v$. Two much studied degree--based graph invariants are the first and second Zagreb indices, defined as $M_1=\sum\limits_{u \in \mathbf V} d(u)^2$ and $M_2 = \sum\limits_{uv \in \mathbf E} d(u)\,d(v)$. A~recently proposed new invariant of this kind is the hyper--Zagreb index, defined as $HZ = \sum\limits_{uv \in \mathbf E} [d(u)+d(v)]^2$. The basic relations between this index and its coindex for a graph $G$ and its complement $\overline G$ are determined.
Classification : 05C07, 05C90
Keywords: degree (of vertex), Zagreb index, hyper-Zagreb index, coindex 
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     author = {Ivan Gutman},
     title = {On {hyper-Zagreb} index and coindex},
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Ivan Gutman. On hyper-Zagreb index and coindex. Bulletin de l'Académie serbe des sciences. Classe des sciences mathématiques et naturelles, Tome 42 (2017), p. 1 . http://geodesic.mathdoc.fr/item/BASS_2017_42_a0/