k-Valued Non-Associative Lambek Categorial Grammars are not Learnable from Strings Denis Béchet author Annie Foret author 2003-07 text Proceedings of the 41st Annual Meeting of the Association for Computational Linguistics Association for Computational Linguistics Sapporo, Japan conference publication bechet-foret-2003-k 10.3115/1075096.1075141 https://aclanthology.org/P03-1045/ 2003-07 351 358