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The graphs with spectral radius between 2 and $$\sqrt{2+\sqrt{5}}$$. (English) Zbl 0678.05038
The graphs in the title have been essentially determined by the reviewer, M. Doob and I. Gutman [On graphs whose spectral radius does not exceed $$\sqrt{2+\sqrt{5}}$$, Ars. Comb. 14, 225-339 (1982; Zbl 0504.05040)]. The present authors have completed the determination of these graphs.
Reviewer: D.Cvetković

##### MSC:
 05C50 Graphs and linear algebra (matrices, eigenvalues, etc.)
Full Text:
##### References:
 [1] Cvetković, D.M.; Doob, M.; Gutman, I., On graphs whose spectral radius does not exceed $$2+5$$, Ars combin., 14, 225-239, (1982) · Zbl 0504.05040 [2] Goodman, F.; de la Harpe, P.; Jones, V., Matrices over natural numbers: values of the norms, classification, and variations, (), Chapter 1 [3] Hoffman, A.J., On limit points of spectral radii of non-negative symmetric integral matrices, (), 165-172 [4] Neumaier, A., The second largest eigenvalue of a tree, Linear algebra appl., 46, 9-25, (1982) · Zbl 0495.05044 [5] Shearer, J., On the distribution of the maximum eigenvalue of graphs, (1986), preprint
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