Abstract
Let $$\fancyscript{B}(n,r)$$B(n,r) be the set of all bicyclic graphs with $$n$$n vertices and $$r$$r cut edges. In this paper we determine the unique graph with maximal adjacency spectral radius or signless Laplacian spectral radius among all graphs in $$\fancyscript{B}(n,r)$$B(n,r).
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