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Dedicated late Dr. Martin Luther King, Jr.
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Butler, K.KH. Canonical bijection betweenD of (0, 1)-matrix semigroupsof (0, 1)-matrix semigroups. Period Math Hung 4, 303–305 (1973). https://doi.org/10.1007/BF02017918
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DOI: https://doi.org/10.1007/BF02017918