Regular elements of the semigroup of all binary relations.
B.M. Schein (1976/77)
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B.M. Schein (1976/77)
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D.W. Hardy, G. Markowsky, R.L. Brandon (1972)
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Ki-Hang, Kim Butler (1974)
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H.J. Bandelt (1980)
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A.H. Clifford (1975)
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K.A. Zareckii (1974)
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A.H. Clifford (1976)
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P.M. Higgins (1994)
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Boris M. Schein (1989)
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D. Strauss (1992)
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