The structure of bisimple orthodox semigroups as ordered pairs.
The structure of orthodox unions of groups.
The structure of bisimple left unipotent semigroups as ordered pairs.
The fundamental representation of a completely regular semigroup.
The free completely regular semigroup on a set.
The partial groupoid of idempotents of a regular semigroup.
The fundamental representation of a regular semigroup.
A proof of the Montague-Plemmons-Schein Theorem on maximal subgroups of the semigroup of binary relations.
Lectures in semigroups, by M. Petrich.
Remarks on 0-minimal quasi-ideals in semigroups.
Radicals in semigroups.
A characterization of ...-classes of semigroups as partial groupoids.
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