@article{PIM_1983_N_S_34_48_a25,
     author = {Miroslav Petrovi\'c},
     title = {On {Graphs} {Whose} {Spectral} {Spread} {Does} not {Exceed} 4},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {169 },
     publisher = {mathdoc},
     volume = {_N_S_34},
     number = {48},
     year = {1983},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PIM_1983_N_S_34_48_a25/}
}