@article{PIM_1975_N_S_19_33_a5,
     author = {Drago\v{s} Cvetkovi\'c},
     title = {Spectra {Of} {Graphs} {Formed} {By} {Some} {Unary} {Operations}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {37 },
     publisher = {mathdoc},
     volume = {_N_S_19},
     number = {33},
     year = {1975},
     url = {http://geodesic.mathdoc.fr/item/PIM_1975_N_S_19_33_a5/}
}