Schützenberger groups of ...-classes in the semigroup of all binary relations on a set.
Addendum to: Representations of inverse semigroups by one-to-one partial transformations of a set.
Congruences on Brandt Semigroups.
Correction to "Congruences on Brandt Semigroups", Math. Annalen 139, 91?94 (1959).
Clifford, A.H. - An appreciation of his his work on the occasion of his sixty-fifth birthday.
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