Semimodularity of the Congruence Lattice on Regular ...-Semigroups.
Permutable duo semigroups.
On the exponent semigroup of an E-m semigroup.
Semigroups whose proper subsemigroups are quasicommutative.
On Ek-semigroups.
On conditionally commutative semigroups.
Some properties of E-m semigroups.
Quasi commutative semigroups and a-reflective semigroups.
On Putcha's Q-semigroups.
Power cancellative semigroups.
Amalgams of free inverse semigroups.
On strongly reversible semigroups.
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