1. Remarques sur les langages de parentheses;Autebert;Theoret. Comput. Sci.,1984
2. Congruences plus que parfaites et langages algébriques;Berstel,1975
3. Grammaires a Non-terminaux séparés;Boasson,1980
4. N.T.S. languages are congruential and deterministic;Boasson;J. Comput. System Sci.,1985
5. N.T.S. grammars and Church-Rosser systems;Book;Inform. Process. Lett.,1981