What do We Know about Conversation Participants: Experiments on Conversation Entailment Chen Zhang author Joyce Chai author 2009-09 text Proceedings of the SIGDIAL 2009 Conference Patrick Healey editor Roberto Pieraccini editor Donna Byron editor Steve Young editor Matthew Purver editor Association for Computational Linguistics London, UK conference publication zhang-chai-2009-know https://aclanthology.org/W09-3930/ 2009-09 206 215