Geodesic
Chromatic Number And The Spectrum Of A Graph
Publications de l'Institut Mathématique, _N_S_14 (1972) no. 28, p. 25 
Dragoš M. Cvetković. Chromatic Number And The Spectrum Of A Graph. Publications de l'Institut Mathématique, _N_S_14 (1972) no. 28, p. 25 . http://geodesic.mathdoc.fr/item/PIM_1972_N_S_14_28_a4/
@article{PIM_1972_N_S_14_28_a4,
     author = {Drago\v{s} M. Cvetkovi\'c},
     title = {Chromatic {Number} {And} {The} {Spectrum} {Of} {A} {Graph}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {25 },
     year = {1972},
     volume = {_N_S_14},
     number = {28},
     url = {http://geodesic.mathdoc.fr/item/PIM_1972_N_S_14_28_a4/}
}
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