@InProceedings{TALN-2011-BDF-CIAA, author = {Denis B\'echet and Alexandre Dikovsky and Annie Foret}, title = {Categorial Grammars with Iterated Types form a Strict Hierarchy of k-Valued Languages}, booktitle = {Implementation and Application of Automata, 16th International Conference, CIAA 2011, Blois, France, July 13-16, 2011. Proceedings}, editor = {B\'eatrice Bouchou-Markhoff and Pascal Caron and Jean-Marc Champarnaud and Denis Maurel}, series = {Lecture Notes in Computer Science (LNCS)}, volume = {6807}, pages = {42--52}, publisher = {Springer}, year = 2011, ISBN = {978-3-642-22255-9}, DOI = {10.1007/978-3-642-22256-6}, URL = {http://ciaa-fsmnlp-2011.univ-tours.fr/ciaa} }