@InProceedings{dorre:1996:ACL,
  author    = {Jochen Dorre},
  title     = {Parsing with Semidirectional Lambek Grammar is NP-Complete},
  booktitle = {Proceedings of the 34th Annual Meeting of the Association for Computational Linguistics},
  month     = {June},
  year      = {1996},
  address   = {Santa Cruz, California, USA},
  publisher = {Association for Computational Linguistics},
  pages     = {95--100},
  url       = {http://www.aclweb.org/anthology/P96-1013},
  doi       = {10.3115/981863.981876}
}