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@article{SF_1974__7_134004, author = {John Rhodes}, title = {Finite binary relations have no more complexity than finite semigroups.}, journal = {Semigroup forum}, pages = {92--103}, publisher = {mathdoc}, volume = {7}, year = {1974}, zbl = {0294.20057}, url = {http://geodesic.mathdoc.fr/item/SF_1974__7_134004/} }
John Rhodes. Finite binary relations have no more complexity than finite semigroups.. Semigroup forum, Tome 7 (1974), pp. 92-103. http://geodesic.mathdoc.fr/item/SF_1974__7_134004/