On Regular Right Duo Semigroups.
On (m,n)-ideals in subcommutative semigroups.
A characterization of semigroups which are semilattices of groups
On existence of the identity element in a semigroup
A remark on right groups
A characterization of semilattices of left groups
A remark on inverse Clifford semigroups
A remark on regular right duo semigroups
On semigroups that are semilattices of left groups
A remark on semigroups that are semilattices of right groups
A characterezation of regular duo semigroups
On regular rings
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