University of Isfahan Transactions on Combinatorics 2251-8657 3 3 2014 09 01 On the eigenvalues of firefly graphs 1 9 5145 10.22108/toc.2014.5145 EN W. X. Hong South China Normal University L. H. You South China Normal University Journal Article 2013 08 14 The sharp upper bounds and the sharp lower bounds of the largest‎ ‎eigenvalues $\lambda_1$‎, ‎the least eigenvalue $\lambda_n$‎, ‎the second largest eigenvalue $\lambda_2$‎, ‎the spread and the‎ ‎separator among all firefly graphs on $n$ vertices are determined‎. Firefly graph largest eigenvalue least eigenvalue spread separator https://toc.ui.ac.ir/article_5145_fcd60657f5c257c62dd43cdec6d979fe.pdf