On semigroups admitting ring structure.
On semigroups admitting ring structure II.
On semigroups admitting ring structure III
On semigroups and uniform partial bands.
On Semigroups Defined by the Identity xxy = y
On semigroups having a kernel
On semigroups in which every Rees one-sided congruence is a congruence.
On semigroups of Boolean ring endomorphisms.
On semigroups of continuous transformations on fuzzily structured sets.
On semigroups of left inner type.
On semigroups that are semilattices of groups
On semigroups that are semilattices of left groups
On semigroups which are not divided by any non-trivial semigroup with an identity.
On semigroups with least generating sets.
On semigroups with minimal or maximal condition on left congruences.
On semigroups with the idealizer condition.
On semigroups with T-ideals
On semilattices of groups whose arrows are epimorphisms.
On semiprime twisted semigroup rings.
On semisimple bands.