The join of the pseudovarieties of idempotent semigroups and locally trivial semigroups. M. Zeitoun — 1995 Semigroup forum
Corrigendum to "The join of the pseudovarieties of idempotent semigroups and locally trivial semigroups". M. Zeitoun — 1996 Semigroup forum
The pseudovariety J is hyperdecidable J. Almeida; M. Zeitoun — 1997 RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications