@InProceedings{janarthanam-lemon:2009:SIGDIAL,
  author    = {Janarthanam, Srinivasan  and  Lemon, Oliver},
  title     = {A Two-Tier User Simulation Model for Reinforcement Learning of Adaptive Referring Expression Generation Policies},
  booktitle = {Proceedings of the SIGDIAL 2009 Conference},
  month     = {September},
  year      = {2009},
  address   = {London, UK},
  publisher = {Association for Computational Linguistics},
  pages     = {120--123},
  url       = {http://www.aclweb.org/anthology/W09-3916}
}