Rowlinson P (1990) More on graph perturbations. Bulletin of the London Mathematical Society, 22 (3), pp. 209-216. https://doi.org/10.1112/blms/22.3.209
Various modifications of a connected graph G are regarded as perturbations of an adjacency matrix A of G. Several results concerning the resulting changes to the largest eigenvalue of A are obtained by solving intermediate eigenvalue problems of the second type.
Bulletin of the London Mathematical Society: Volume 22, Issue 3
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