On a pull-back diagram for orthodox semigroups.
On a wreath product embedding and idempotent pure congruences on inverse semigroups.
On congruences of ...x-normal semigroups.
On endomorphisms and partial transformations.
On epics and dominions of bands.
On exposed semigroup homomorphisms.
On free products of bicyclic monoids.
On idempotent semifields and a paper by H. Hutchins.
On linear algebraic semigroups. III.
On medial local semigroups.
On recognition and compactification.
On right congruences associated with the input semigroup S of automata.
On semigroups of Boolean ring endomorphisms.
On semigroups of left inner type.
On semigroups with minimal or maximal condition on left congruences.
On some non-rational congruences on free commutative semigroups.
On some problems of Petrich concerning Brück and Reilly semigroups.
On spectra of solvability and attainability for varieties of semigroups.
On the E-unitary covers for a Bruck semigroup.
On the lattice of completely-simple congruences on a Croisot-Tessier semigroup.