Geodesic
Upper bound for the energy of graphs with fixed second and fourth spectral moments
Kragujevac Journal of Mathematics, Tome 32 (2009) no. 1.

Voir la notice de l'article provenant de la source eLibrary of Mathematical Institute of the Serbian Academy of Sciences and Arts

A method, earlier put forward for estimating from above the energy of a bipartite graph is modified so as to be applicable to any graph. The upper bound thus obtained is a function of the second and fourth spectral moments, whose dependence on graph structure is well known. 
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     author = {Ivan Gutman and El{\'\i}as Gudi\~no and Domingo Quiroz},
     title = {Upper bound for the energy of graphs with fixed second and fourth spectral moments},
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     publisher = {mathdoc},
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     year = {2009},
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Ivan Gutman; Elías Gudiño; Domingo Quiroz. Upper bound for the energy of graphs with fixed second and fourth spectral moments. Kragujevac Journal of Mathematics, Tome 32 (2009) no. 1. http://geodesic.mathdoc.fr/item/KJM_2009_32_1_a2/