@InProceedings{ai-tetreault-litman:2007:ShortPapers,
  author    = {Ai, Hua  and  Tetreault, Joel  and  Litman, Diane},
  title     = {Comparing User Simulation Models For Dialog Strategy Learning},
  booktitle = {Human Language Technologies 2007: The Conference of the North American Chapter of the Association for Computational Linguistics; Companion Volume, Short Papers},
  month     = {April},
  year      = {2007},
  address   = {Rochester, New York},
  publisher = {Association for Computational Linguistics},
  pages     = {1--4},
  url       = {http://www.aclweb.org/anthology/N/N07/N07-2001}
}