Constructing finitely presented monoids which have no finite complete presentation. Y. Kobayashi, M. Katsura (1997) Semigroup forum
Construction de codes indécomposables Max Vincent (1985) RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications
Contractive representations: A family of inverse monoids and semigroups and finite R-classes. J.B. Stephen (1992) Semigroup forum
Corrigendum to "Infinite words and permutation properties". J. Justin, G. Pirillo (1991) Semigroup forum
Corrigendum to "The join of the pseudovarieties of idempotent semigroups and locally trivial semigroups". M. Zeitoun (1996) Semigroup forum
Crossability of cancellative Kleene semigroups C. P. Rupert (1992) RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications