@InCollection{ PurverGinzburgHealey03Book,
  author = "Purver, Matthew and Ginzburg, Jonathan and Healey, Patrick",
  title = "On the Means for Clarification in Dialogue",
  year = 2003,
  booktitle = "Current and New Directions in Discourse and Dialogue",
  editor = "Smith, R. and van Kuppevelt, J.",
  publisher = "Kluwer Academic Publishers",
  series = "Text, Speech and Language Technology",
  volume = 22,
  pages = "235--255",
  annote = "ISBN 1-4020-1615-8",
  isbn = "1-4020-1615-8",
  url = "http://www.dcs.qmul.ac.uk/~mpurver/papers/pgh03book.pdf",
  url = "http://link.springer.com/chapter/10.1007%2F978-94-010-0019-2_11",
}