@InProceedings{ai-litman:2008:ACLMain,
  author    = {Ai, Hua  and  Litman, Diane J.},
  title     = {Assessing Dialog System User Simulation Evaluation Measures Using Human Judges},
  booktitle = {Proceedings of ACL-08: HLT},
  month     = {June},
  year      = {2008},
  address   = {Columbus, Ohio},
  publisher = {Association for Computational Linguistics},
  pages     = {622--629},
  url       = {http://www.aclweb.org/anthology/P/P08/P08-1071}
}