A general inequality for non-negative real numbers is proven. Based on it, upper bounds for (ordinary) graph energy, minimum dominating energy, minimum covering energy, Laplacian-energy-like invariant, Laplacian energy, Randic energy, and incidence energy are obtained.
['Igor Z. Milovanovic', 'Emina I. Milovanovic', 'Ivan Gutman']
Upper bounds for some graph energies