On recognition and compactification.
On regular implicit operations
On regular semigroup rings.
On semidirect and two-sided semidirect products of finite trivial monoids
On semidirect products of two finite semilattices.
On Semigroups Defined by the Identity xxy = y
On semigroups with least generating sets.
On semisimple bands.
On some systems of equations with constraints in a free group. – Addenda. (Sur certains systèmes d'équations avec constraintes dans un groupe libre. – Addenda.)
On some systems of equations with constraints in a free group. (Sur certains systèmes d'équations avec contraintes dans un groupe libre.)
On spectra of solvability and attainability for varieties of semigroups.
On the axiomatic rank of varieties generated by a semigroup or monoid with one defining relation.
On the classes of orderable semigroups in varieties.
On the congruence extension property.
On the finite basis property for semigroup varieties.
On the lattice of completely regular monoid varieties.
On the lattice of varieties of completely simple semigroups.
On the membership problem for pseudo-varieties of commutative semigroups.
On the Pin-Thérien expansion of idempotent monoids.
On the power semigroup of a finite semigroup