Geodesic
New theorems for signless Laplacian eigenvalues
Bulletin de l'Académie serbe des sciences. Classe des sciences mathématiques et naturelles, Tome 33 (2008) no. 1 Cet article a éte moissonné depuis la source eLibrary of Mathematical Institute of the Serbian Academy of Sciences and Arts

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We extend our previous surveys of properties of spectra of signless Laplacians of graphs. Some new theorems for the signless Laplacian eigenvalues are given. In particular, a theorem on spectral characterization of graphs with $Q$-index not exceeding 4 is proved. The signless Laplacian eigenvalues of connected graphs on six vertices are given in Appendix. 
@article{BASS_2008_33_1_a6,
     author = {D. Cvetkovi\'c},
     title = {New theorems for signless {Laplacian} eigenvalues},
     journal = {Bulletin de l'Acad\'emie serbe des sciences. Classe des sciences math\'ematiques et naturelles},
     pages = {131 - 146},
     year = {2008},
     volume = {33},
     number = {1},
     zbl = {1199.05212},
     url = {http://geodesic.mathdoc.fr/item/BASS_2008_33_1_a6/}
}
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D. Cvetković. New theorems for signless Laplacian eigenvalues. Bulletin de l'Académie serbe des sciences. Classe des sciences mathématiques et naturelles, Tome 33 (2008) no. 1. http://geodesic.mathdoc.fr/item/BASS_2008_33_1_a6/