Ranks of binary relations.
V. Froidure (1997)
Semigroup forum
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V. Froidure (1997)
Semigroup forum
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M. Breen (1994)
Semigroup forum
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G.B. Preston (1974)
Semigroup forum
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A.T. Lisan (1991)
Semigroup forum
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D.W. Hardy, G. Markowsky, R.L. Brandon (1972)
Semigroup forum
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B.M. Schein (1976/77)
Semigroup forum
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J. Néraud (1990)
Semigroup forum
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K.A. Zareckii (1974)
Semigroup forum
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R.J. Plemmons, B.M. Schein (1970)
Semigroup forum
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F.W. Roush, K.H. Kim (1977)
Semigroup forum
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