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Omidi, G. R. A spectral excess theorem for normal digraphs. (English) Zbl 1319.05062 J. Algebr. Comb. 42, No. 2, 537-554 (2015). MSC: 05C20 05C12 05C50 05E30 PDFBibTeX XMLCite \textit{G. R. Omidi}, J. Algebr. Comb. 42, No. 2, 537--554 (2015; Zbl 1319.05062) Full Text: DOI arXiv