@InProceedings{bohus-horvitz:2009:SIGDIAL1,
  author    = {Bohus, Dan  and  Horvitz, Eric},
  title     = {Models for Multiparty Engagement in Open-World Dialog},
  booktitle = {Proceedings of the SIGDIAL 2009 Conference},
  month     = {September},
  year      = {2009},
  address   = {London, UK},
  publisher = {Association for Computational Linguistics},
  pages     = {225--234},
  url       = {http://www.aclweb.org/anthology/W09-3933}
}