◦Algebraic Graph Theory. C. Godsil and G.F. Royle. Springer. (2001)
◦Combinatorics and Graph Theory. J. Harris, J.L. Hirst and M.Mossinghoff. Springer. (2010)
◦Introduction to Graph Theory. R. J. Trudeau. Dover. (1994)
◦Topological Graph Theory. J.L. Gross and T.W. Tucker. Wiley-Interscience. (1987)

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