Publications de l'Institut Mathématique, Nouvelle Série Vol. 88(102), pp. 77–86 (2010) 

MAXIMAL CANONICAL GRAPHS WITH SEVEN NONZERO EIGENVALUESMirjana LazicDepartment of Mathematics, University of Kragujevac, Kragujevac, SerbiaAbstract: In [3] and [4] A. Torgasev described all finite and infinite connected graphs having $3,4$ or $5$ nonzero eigenvalues (not necessarily distinct). In the same papers he has given a general method how to describe all connected graphs with any fixed number of nonzero eigenvalues. In [2] M. Lepovic applying his method described all finite connected graphs which have exactly $6$ nonzero eigenvalues. We here describe all finite connected graphs with exactly $7$ nonzero eigenvalues. Keywords: Spectra of graphs, Maximal canonical graphs Classification (MSC2000): 05C50 Full text of the article: (for faster download, first choose a mirror)
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