@InProceedings{crescenzi-EtAl:2011:ACL-HLT2011,
  author    = {Crescenzi, Pierluigi  and  Gildea, Daniel  and  Marino, Andrea  and  Rossi, Gianluca  and  Satta, Giorgio},
  title     = {Optimal Head-Driven Parsing Complexity for Linear Context-Free Rewriting Systems},
  booktitle = {Proceedings of the 49th Annual Meeting of the Association for Computational Linguistics: Human Language Technologies},
  month     = {June},
  year      = {2011},
  address   = {Portland, Oregon, USA},
  publisher = {Association for Computational Linguistics},
  pages     = {450--459},
  url       = {http://www.aclweb.org/anthology/P11-1046}
}