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Citation

Rowlinson P (2020) A problem concerning graphs with just three distinct eigenvalues. Linear Algebra and its Applications, 592, pp. 260-269. https://doi.org/10.1016/j.laa.2020.01.024

Abstract
We investigate the problem of finding all the biregrular graphs with just three adjacency eigenvalues, one of which is an eigenvalue ≠ -1, 0 of maximal possible multiplicity.

Keywords
Biregular graph; Eigenvalue multiplicity; Main eigenvalue; Star complement; Strongly regular graph

Journal
Linear Algebra and its Applications: Volume 592