@article{BASS_2007_32_1_a3,
     author = {D. Cvetkovi\'c and J. Grout},
     title = {Graphs with extremal energy should have a small number of distinct eigenvalues},
     journal = {Bulletin de l'Acad\'emie serbe des sciences. Classe des sciences math\'ematiques et naturelles},
     pages = {43 - 57},
     publisher = {mathdoc},
     volume = {32},
     number = {1},
     year = {2007},
     zbl = {1199.05213},
     url = {http://geodesic.mathdoc.fr/item/BASS_2007_32_1_a3/}
}