@InProceedings{IRISA-2003-BF-ACL03,
 author       = {Denis B\'echet and Annie Foret},
 title        = {k-valued Non-Associative {L}ambek Categorial Grammars
                  are not Learnable from Strings},
 booktitle    = {Proceedings of the 41st Annual Meeting of the Association
                  for Computational Linguistics (ACL~2003),
                  Sapporo, Japan, July 2003},
 pages        = {351--358},
 publisher    = {ACL},
 year         = 2003,
 month        = jul,
 ISBN         = {1-932432-09-4},
 DOI          = {10.3115/1075096.1075141},
 URL          = {http://www.aclweb.org/anthology/P03-1045}
}