The paper claims the spectra of prefix-reversal graphs contain long intervals of consecutive integers, but the supporting eigenvector computations are incorrect for small parameters.
Spectra and eigenspaces from regular partitions of cayley (di)graphs of permutation groups.Linear Algebra and its Applications 597 (2020), 94–112
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On the spectra of prefix-reversal graphs
The paper claims the spectra of prefix-reversal graphs contain long intervals of consecutive integers, but the supporting eigenvector computations are incorrect for small parameters.