On quasi completely regular semigroups.
On Quasi Divisor Theories and Systems of Valuations.
On quasi-ideals in contracted semigroups rings.
On quasi-ideals of semirings.
On quasi-transitive semigroup actions.
On -commutativity of -permutable semigroups.
On Radicals in a Certain Class of Semigroups
On radicals in semigroups
On radicals of the semigroup of triangular matrices
On recognition and compactification.
On Reconstruction of Monoids from Their Table Fragments.
On Regular Anti-congruence in Anti-ordered Semigroups
On regular implicit operations
On Regular Right Duo Semigroups.
On regular ring-semigroups and semirings
On regular semigroup rings.
On regular semigroups and their multiplication.
On regularity classes of binary relations
On representation of commutative semigroups.
On representations of monoids as monoids of polynomials