@InProceedings{ai-weng:2008:SIGDIAL,
  author    = {Ai, Hua  and  Weng, Fuliang},
  title     = {User Simulation as Testing for Spoken Dialog Systems},
  booktitle = {Proceedings of the 9th SIGdial Workshop on Discourse and Dialogue},
  month     = {June},
  year      = {2008},
  address   = {Columbus, Ohio},
  publisher = {Association for Computational Linguistics},
  pages     = {164--171},
  url       = {http://www.aclweb.org/anthology/W/W08/W08-0126}
}