Geodesic
Maximal Canonical Graphs with Seven Nonzero Eigenvalues
Publications de l'Institut Mathématique, _N_S_88 (2010) no. 102, p. 77 .

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In [3] and [4] A. Torgašev 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. Lepović 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.
Classification : 05C50
Keywords: Spectra of graphs, Maximal canonical graphs 
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     author = {Mirjana Lazi\'c},
     title = {Maximal {Canonical} {Graphs} with {Seven} {Nonzero} {Eigenvalues}},
     journal = {Publications de l'Institut Math\'ematique},
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     year = {2010},
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Mirjana Lazić. Maximal Canonical Graphs with Seven Nonzero Eigenvalues. Publications de l'Institut Mathématique, _N_S_88 (2010) no. 102, p. 77 . http://geodesic.mathdoc.fr/item/PIM_2010_N_S_88_102_a4/