Geodesic
Spectral characterizations of some distance-regular graphs
Journal of Algebraic Combinatorics, Tome 15 (2002) no. 2, pp. 189-202.

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Summary: When can one see from the spectrum of a graph whether it is distance-regular or not? We give some new results for when this is the case. As a consequence we find (among others) that the following distance-regular graphs are uniquely determined by their spectrum: The collinearity graphs of the generalized octagons of order (2,1), (3,1) and (4,1), the Biggs-Smith graph, the $M _{22}$ graph, and the coset graphs of the doubly truncated binary Golay code and the extended ternary Golay code.
Keywords: distance regular graphs, eigenvalues, cospectral graphs 
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     author = {van Dam, Edwin R. and Haemers, Willem H.},
     title = {Spectral characterizations of some distance-regular graphs},
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     url = {http://geodesic.mathdoc.fr/item/JAC_2002__15_2_a0/}
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van Dam, Edwin R.; Haemers, Willem H. Spectral characterizations of some distance-regular graphs. Journal of Algebraic Combinatorics, Tome 15 (2002) no. 2, pp. 189-202. http://geodesic.mathdoc.fr/item/JAC_2002__15_2_a0/