@inproceedings{clark-popescubelis:2004:SIGDIAL,
  author    = {Clark, Alexander  and  Popescu-Belis, Andrei},
  title     = {Multi-level Dialogue Act Tags },
  booktitle = {Proceedings of the 5th SIGdial Workshop on Discourse and Dialogue },
  editor = {Michael Strube and Candy Sidner},
  year      = 2004,
  month     = {April 30 - May 1},
  address   = {Cambridge, Massachusetts, USA},
  publisher = {Association for Computational Linguistics},
  pages     = {163--170}
}