@article{10_2298_BMAT0530085C,
     author = {D. Cvetkovi\'c},
     title = {Signless {Laplacians} and line graphs},
     journal = {Bulletin de l'Acad\'emie serbe des sciences. Classe des sciences math\'ematiques et naturelles},
     pages = {85 },
     publisher = {mathdoc},
     volume = {30},
     year = {2005},
     doi = {10.2298/BMAT0530085C},
     zbl = {1119.05066},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.2298/BMAT0530085C/}
}