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"Central groupoids, central digraphs, and zero-one matrices A satisfying ..."
Frank E. Curtis et al. (2004)
- Frank E. Curtis, John Drew, Chi-Kwong Li, Daniel Pragel:
Central groupoids, central digraphs, and zero-one matrices A satisfying A2=J . J. Comb. Theory A 105(1): 35-50 (2004)
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