@inproceedings{Heeman3,
  author = "Peter A. Heeman",
  title = "Collaborating on referring expressions",
  booktitle = "Proceedings, 29th annual meeting of the Association for Computational Linguistics",
  address = "Berkeley, CA",
  month = "June",
  year = "1991",
  pages = "345--346",
  download = "http://ftp.cs.toronto.edu/pub/gh/Heeman-91.pdf"
}