@InProceedings{gomezrodriguez-EtAl:2009:NAACLHLT09,
  author    = {G\'{o}mez-Rodr\'{i}guez, Carlos  and  Kuhlmann, Marco  and  Satta, Giorgio  and  Weir, David},
  title     = {Optimal Reduction of Rule Length in Linear Context-Free Rewriting Systems},
  booktitle = {Proceedings of Human Language Technologies: The 2009 Annual Conference of the North American Chapter of the Association for Computational Linguistics},
  month     = {June},
  year      = {2009},
  address   = {Boulder, Colorado},
  publisher = {Association for Computational Linguistics},
  pages     = {539--547},
  url       = {http://www.aclweb.org/anthology/N/N09/N09-1061}
}