On bands, free bands and identities.
Inverse semigroup varieties with the amalgamation property.
Epimorphisms and dominions.
Some properties of local subsemigroups inherited by larger subsemigroups.
On congruences on finite semigroups.
The partially ordered set of all J-classes of a finite semigroup.
Invers SEMIGROUPS ON GRAPHS.
Reconstructing some idempotent-generated semigroups from their biordered sets.
A characterization of ...-classes of semigroups as partial groupoids.
An addition theorem for finite semigroups.
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