A note on pseudocongruences in semigroups.
A note on minimal and maximal ideals of ordered semigroups.
Bi-ideals in ordered semigroups and ordered groups.
Retract extensions of ordered sets.
On regular and intra-regular poe semigroups.
Generalized ideal elements in poe-semigroups.
A characterization of regular le-semigroups.
On left (resp. right) duo regular poesemigroups.
On intra-regular ve-semigroups.
On regular le-semigroups.
On left regular and left duo poe-semigroups.
On prime, weakly prime ideals in ordered semigroups.
On weakly commutative poe-semigroups.
On intra-regular ordered semigroups.
The embedding of an ordered semigroup in a simple one with identity.
On subdirectly irreducible ordered semigroups.
Pseudoorder in ordered semigroups.
On the decomposition of prime ideals of ordered semigroups into their N-classes.
On weakly commutative poe-semigroups.
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