@inproceedings{crook-etal-2009-unsupervised,
    title = "Unsupervised Classification of Dialogue Acts using a {D}irichlet Process Mixture Model",
    author = "Crook, Nigel  and
      Granell, Ramon  and
      Pulman, Stephen",
    editor = "Healey, Patrick  and
      Pieraccini, Roberto  and
      Byron, Donna  and
      Young, Steve  and
      Purver, Matthew",
    booktitle = "Proceedings of the {SIGDIAL} 2009 Conference",
    month = sep,
    year = "2009",
    address = "London, UK",
    publisher = "Association for Computational Linguistics",
    url = "https://preview.aclanthology.org/landing_page/W09-3951/",
    pages = "341--348"
}