@InProceedings{ PurverGinzburgHealey01SIGdial,
  author = "Purver, Matthew and Ginzburg, Jonathan and Healey, Patrick",
  title = "On the Means for Clarification in Dialogue",
  year = 2001,
  booktitle = "Proceedings of the 2nd SIGdial Workshop on Discourse and Dialogue",
  address = "Aalborg, Denmark",
  month = sep,
  organization = "Association for Computational Linguistics",
  pages = "116--125",
  url = "http://www.eecs.qmul.ac.uk/~mpurver/papers/pgh01sigdial.pdf",
  url = "http://aclweb.org/anthology/W01-1616",
  doi       = "10.18653/v1/W01-1616",
  url       = "http://dx.doi.org/10.18653/v1/W01-1616",
}