On the fundamental double four-spiral semigroup.
On regular semigroups and their multiplication.
A construction of inverse semigroups.
The structure of regular semigroups, II: Cross connections.
The multiplicative behavior of H.
Extensions idéales strictes et pures d'un demi-groupe
Sur la notion d'équivalence principale
Sur les extensions idéales d'un demi-groupe
The structure of regular semigroups, I: A representation.
The structure of regular semigroups, III: The reduced case.
A completion theorem for finitely generated commutative semigroups.
The structure of regular semigroups, IV: The general case.
A precedence theorem for semigroups.
Cancellative actions
The following problem is considered: when can the action of a cancellative semigroup on a set be extended to a simply transitive action of the universal group of on a larger set.
Demi-groupes compacts
On strict extensions of semigroups.
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