Semigroups containing covered one-sided ideals
Semigroups containing covered two-sided ideals
Semigroups containing maximal ideals
Semigroups containing no maximal ideals.
Semigroups in which prime ideals are maximal.
Semigroups whose proper left ideals are commutative
Semigroups whose proper one-sided ideals are t - archimedean
Semigroups whose proper subsemigroups are duo
Semigroups whose proper subsemigroups are -regular
Semigroups whose proper two-sided ideals are power joined.
Semigroups with n-closed subsets.
Semigroups with No Non-Zero Nilpotent Elements.
Semigroups with strong and nonstrong magnifying elements.
Smallest A-ideals in semigroups.
Some properties of -ideals and generalized -ideals, -semigroups and -groups
Some remarks on Lorenzen -group of partly ordered groups
Some results on ordered filters of implicative semigroups.
S-sets and semigroups of quotients.
Stratified semigroups.
Structure and ideal theory of commutative semigroups