Geodesic
Comparative study of graph energies
Bulletin de l'Académie serbe des sciences. Classe des sciences mathématiques et naturelles, Tome 37 (2012) no. 1.

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

The ordinary energy of the graph is defined as the sum of the absolute values of the eigenvalues of its adjacency matrix. In recent times analogous “energies” are being considered, based on the eigenvalues of a variety of other graph matrices. We briefly survey and comment this “energy deluge”, and then show that some of the results obtained (one-byone) for different graph energies, are special cases of a single general result, that is independent of any graph–theoretical interpretation. 
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I. Gutman. Comparative study of graph energies. Bulletin de l'Académie serbe des sciences. Classe des sciences mathématiques et naturelles, Tome 37 (2012) no. 1. http://geodesic.mathdoc.fr/item/BASS_2012_37_1_a0/