@InProceedings{zhang-chai:2009:SIGDIAL,
  author    = {Zhang, Chen  and  Chai, Joyce},
  title     = {What do We Know about Conversation Participants: Experiments on Conversation Entailment},
  booktitle = {Proceedings of the SIGDIAL 2009 Conference},
  month     = {September},
  year      = {2009},
  address   = {London, UK},
  publisher = {Association for Computational Linguistics},
  pages     = {206--215},
  url       = {http://www.aclweb.org/anthology/W09-3930}
}