@article{PIM_1998_N_S_63_77_a5,
     author = {Mirko Lepovi\'c},
     title = {On {Formal} {Products} and the {Seidel} {Spectrum} of {Graphs}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {37 },
     publisher = {mathdoc},
     volume = {_N_S_63},
     number = {77},
     year = {1998},
     zbl = {0942.05038},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PIM_1998_N_S_63_77_a5/}
}