@inproceedings{Bechet:2003:ACL,
  author = {B\'{e}chet, Denis  and  Foret, Annie},
  title  = {k-Valued Non-Associative Lambek Categorial Grammars are not Learnable from Strings},
  booktitle = {Proceedings of the 41st Annual Meeting of the Association for Computational Linguistics},
  editor = {Erhard Hinrichs and Dan Roth},
  url    = {http://www.aclweb.org/anthology/P03-1045.pdf},
  year   = 2003,
  pages  = {351--358}
}