Geodesic
Weakly Cospectral Graphs
Matematičeskie zametki, Tome 75 (2004) no. 4, pp. 614-623.

Voir la notice de l'article provenant de la source Math-Net.Ru

It is proved that any set of finite pairwise nonisomorphic weakly cospectral connected pseudographs, as well as any set of pseudodigraphs satisfying various additional conditions, is finite. 
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S. P. Strunkov. Weakly Cospectral Graphs. Matematičeskie zametki, Tome 75 (2004) no. 4, pp. 614-623. http://geodesic.mathdoc.fr/item/MZM_2004_75_4_a10/

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