@article{KJM_2009_32_a2,
     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},
     journal = {Kragujevac Journal of Mathematics},
     pages = {27 },
     publisher = {mathdoc},
     volume = {32},
     year = {2009},
     zbl = {1199.05220},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/KJM_2009_32_a2/}
}