The bifree regular E-solid semigroups.
The concept of structural regularity.
The congruence class of an idempotent in a regular semigroup.
The existence of identity of orthodox semigroup rings.
The Iséki-type characterization of certain regular ordered semigroups
The largest proper regular ideal of
The least semilattice of groups congruence on an eventually regular semigroup.
The Mitsch order on a semigroup.
The monoid of strong endomorphisms of a graph.
The pseudovariety generated by completely 0-simple semigroups.
The semigroup generated by certain operators on the congruence lattice of a Clifford semigroup.
The semigroup of Fredholm operators.
The structure of P-regular semigroups.
The structure of w-regular semigroups.
The structure of -regular semigroups
The translational hull of a normal cryptogroup
Tolerance relations on eventually regular semigroups.