Bounds on the Index and Period of a Binary Relation on a Finite Set
G. Markowsky, "Bounds on the Index and Period of a Binary Relation on a Finite Set," Semigroup Forum, vol. 13, no. 1, pp. 253-259, Springer Verlag, Dec 1976.
The definitive version is available at http://dx.doi.org/10.1007/BF02194943
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© 1976 Springer Verlag, All rights reserved.