@article{PIM_1975_N_S_18_32_a3,
     author = {D. M. Cvetkovi\'c and I. Gutman},
     title = {On {Spectral} {Structure} {Of} {Graphs} {Having} {The} {Maximal} {Eigenvalue} {Not} {Grater} {Than} {Two}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {39 },
     publisher = {mathdoc},
     volume = {_N_S_18},
     number = {32},
     year = {1975},
     url = {http://geodesic.mathdoc.fr/item/PIM_1975_N_S_18_32_a3/}
}