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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     author = {S. P. Strunkov},
     title = {On weakly cospectral graphs},
     journal = {Matemati\v{c}eskie zametki},
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     publisher = {mathdoc},
     volume = {80},
     number = {4},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2006_80_4_a15/}
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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/