@InProceedings{maccartney-manning:2009:IWCS-8,
  author    = {MacCartney, Bill  and  Manning, Christopher D.},
  title     = {An extended model of natural logic},
  booktitle = {Proceedings of the Eight International Conference on Computational Semantics},
  month     = {January},
  year      = {2009},
  address   = {Tilburg, The Netherlands},
  publisher = {Association for Computational Linguistics},
  pages     = {140--156},
  url       = {http://www.aclweb.org/anthology/W09-3714}
}