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@article{SF_1976__13_134218, author = {G. Markowsky}, title = {Bounds on the index and period of a binary relation on a finite set.}, journal = {Semigroup forum}, pages = {253--260}, publisher = {mathdoc}, volume = {13}, year = {1976}, zbl = {0353.20055}, url = {http://geodesic.mathdoc.fr/item/SF_1976__13_134218/} }
G. Markowsky. Bounds on the index and period of a binary relation on a finite set.. Semigroup forum, Tome 13 (1976), pp. 253-260. http://geodesic.mathdoc.fr/item/SF_1976__13_134218/