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@article{PIM_1978_N_S_23_37_a5, author = {Drago\v{s} M. Cvetkovi\'c}, title = {The {Main} {Part} {Of} {The} {Spectrum,} {Divisors} {And} {Switching} {Of} {Graphs}}, journal = {Publications de l'Institut Math\'ematique}, pages = {31 }, publisher = {mathdoc}, volume = {_N_S_23}, number = {37}, year = {1978}, url = {http://geodesic.mathdoc.fr/item/PIM_1978_N_S_23_37_a5/} }
Dragoš M. Cvetković. The Main Part Of The Spectrum, Divisors And Switching Of Graphs. Publications de l'Institut Mathématique, _N_S_23 (1978) no. 37, p. 31 . http://geodesic.mathdoc.fr/item/PIM_1978_N_S_23_37_a5/