1. S. Butler, Eigenvalues and structures of graphs, Ph.D. Dissertation, University of California, San Diego, 2008.
2. An interlacing result on normalized Laplacians;Chen;SIAM J. Discrete Math.,2004
3. Spectral Graph Theory;Chung,1997
4. Spectra of Graphs;Cvetković,1980
5. The algebraic connectivity of graphs under perturbation;Guo;Linear Algebra Appl.,2010