Representations of ordered semigroups by real numbers.
Right congruences In totally 0-simple semigroups.
Right PP monoids with central idempotents.
Right Prime Ideals and Maximal Right Ideals in Semigroups
R-unipotent congruences on regular semigroups.
Sandwich sets and partial order.
SAP compactifications of N-fold and infinite semidirect products.
Schützenberger Groups of ...-Classes Containing Odd Degree Polynomials.
Selfdistributive groupoids. Part D1: Left distributive semigroups
Semi-Characters of the Multiplicative Semigroup of Integers Modulo
Semigroup representations of commutative idempotent Abelian groupoids
Semigroups all but one of whose proper subsemigroups are groups.
Semigroups and rings whose proper one-sided ideals are power joined
Semigroups and the structure of categories
Semigroups and their lattice of congruences.
Semigroups and their lattice of congruences II.
Semigroups and their natural order
Semigroups and their subsemigroup lattices.
Semigroups containing maximal ideals
Semigroups containing ubiquitous elements.