[1] Oliveira, C.S., De Lima, L.S., De Abreu, N.M.M. and Hansen, P. (2010) Bound on the Index of the Signless Laplacian of a Graph. Discrete Applied Mathematics, 158, 355-360.
http://dx.doi.org/10.1016/j.dam.2009.06.023
[2] Li, J. and Pan, Y. (2004) Upper Bounds for the Laplacian Graph Eigenvalues. Acta Mathematica Sinica, English Series, 20, 803-806.
http://dx.doi.org/10.1007/s10114-004-0332-4
[3] Liu, H., Lu, M. and Tian, F. (2004) On the Laplacian Spectral Radius of a Graph. Linear Algebra and Its Applications, 376, 135-141.
http://dx.doi.org/10.1016/j.laa.2003.06.007
[4] Rojo, O. and Soto, R.L. (2013) A New Upper Bound on the Largest Normalized Laplacian Eigenvals. Operators and Matrices, 7, 323-332.
http://dx.doi.org/10.7153/oam-07-19
[5] Wolkowich, H. and Styan, G.P.H. (1980) Bounds for Eigenvalues Using Traces of Matrice. Linear Algebra and Its Applications, 29, 471-506.
http://dx.doi.org/10.1016/0024-3795(80)90258-X