1. S. Akbari, M.R. Oboudi, On the edge cover polynomial of a graph (submitted for publication).
2. An extension of the bivariate chromatic polynomial;Averbouch;European Journal of Combinatorics,2010
3. Graph theory;Bondy,2008
4. On the location of roots of independence polynomials;Brown;Journal of Algebraic Combinatorics,2004
5. Spectra of Graphs, Theory and Applications;Cvetković,1995