On a subclass of context-free groups
On a sublattice- of the lattice of congruences on a 0-regular semigroup.
On a technique for representing semigroups as endomorphism semigroups of graphs with given property.
On a theorem of Šutov.
On a type of matrix semigroup.
On a wreath product embedding and idempotent pure congruences on inverse semigroups.
On a wreath product embedding for regular semigroups.
On algebraic closure and amalgamation of semigroups.
On algebraically compact semigroup rings.
On almost semigroups
On an application of the work of D.E. Knuth to semigroups.
On anticommutative semirings.
On anti-inverse semigroups.
On autogenerating systems
On automorphisms of transformation semigroups.
On bands, free bands and identities.
On bands in which every finitely generated subband is an endomorphic image.
On bases and maximal ideals in semigroups
On bases of completely simple semigroups identities.
On basis of identities of Brandt semigroups.