Geodesic
On weakly cospectral graphs
Matematičeskie zametki, Tome 80 (2006) no. 4, pp. 627-629.

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We prove that any set of pair-wise nonisomorphic strongly connected weakly cospectral pseudodigraphs whose set of nilpotency indices is finite also is finite. 
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S. P. Strunkov. On weakly cospectral graphs. Matematičeskie zametki, Tome 80 (2006) no. 4, pp. 627-629. http://geodesic.mathdoc.fr/item/MZM_2006_80_4_a15/

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