1. Bourreau, P. (2013). Traitement d’ellipses: Deux approches par les grammaires catégorielles abstraites. In Actes de Traitement Automatique du Langage Naturel—TALN 2013.
2. Bourreau, P., Kallmeyer, L., & Salvati, S. (2012). On IO-copying and mildly-context sensitive formalisms. In Proceedings of Formal Grammar 2012.
3. Chomsky, N. (1956). Three models for the description of language. IRE Transactions on Information Theory, 2, 113–124.
4. Culy, C. (1987). The complexity of the vocabulary of bambara. In W. Savitch, E. Bach, W. Marsh, & G. Safran-Naveh (Eds.), The formal complexity of natural language, Studies in linguistics and philosophy (Vol. 33, pp. 349–357). Netherlands: Springer.
5. Damm, W. (1982). The IO- and OI-hierarchies. Theoretical Computer Science, 20, 95–207.