1. Algebraic Graph Theory;Biggs,1974
2. Spectra of Graphs. Theory and Applications;Cvetković,1980
3. M.A. Fiol, M. Mitjana, The local spectra of regular line graphs, Discrete Math. (submitted for publication) E-prints UPC, UPCommons, http://hdl.handle.net/2117/735
4. Methods and problems of communication in usual networks;Fraigniaud;Discrete Appl. Math.,1994
5. Algebraic Combinatorics;Godsil,1993