@inproceedings{CarpenterPollard91,
  author	= {Carpenter, Bob and Pollard, Carl},
  year		= {1991},
  title		= {Inclusion, Disjointness and Choice: the logic of linguistic classification},
  booktitle	= {Annual Meeting of the Assocation for Computational Linguistics},
  pages		= {9--16},
  publisher	= {Association for Computational Linguistics},
  address	= {Berkeley, California}
}