@article{10_2298_PIM0999019C,
     author = {Drago\v{s} Cvetkovi\'c and Slobodan K. Simi\'c},
     title = {TOWARDS {A} {SPECTRAL} {THEORY} {OF} {GRAPHS} {BASED} {ON} {THE} {SIGNLESS} {LAPLACIAN,} {I}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {19 },
     publisher = {mathdoc},
     volume = {_N_S_85},
     number = {99},
     year = {2009},
     doi = {10.2298/PIM0999019C},
     zbl = {1224.05293},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.2298/PIM0999019C/}
}