@InProceedings{ PurverEtAl03SIGdial,
  author = "Purver, Matthew and Healey, Patrick G. T. and King, James and Ginzburg, Jonathan and Mills, Greg J.",
  title = "Answering Clarification Questions",
  booktitle = "Proceedings of the 4th {SIGdial} Workshop on Discourse and Dialogue",
  organization = "Association for Computational Linguistics",
  address = "Sapporo, Japan",
  year = 2003,
  month = jul,
  pages = "23--33",
  url = "http://www.dcs.qmul.ac.uk/~mpurver/papers/purver-et-al03sigdial.pdf",
  url = "http://www.aclweb.org/anthology/W03-2103",
  doi       = "10.18653/v1/W03-2103",
  url       = "http://dx.doi.org/10.18653/v1/W03-2103",
}