@inproceedings{janarthanam-lemon-2009-two,
    title = "A Two-Tier User Simulation Model for Reinforcement Learning of Adaptive Referring Expression Generation Policies",
    author = "Janarthanam, Srinivasan  and
      Lemon, Oliver",
    editor = "Healey, Patrick  and
      Pieraccini, Roberto  and
      Byron, Donna  and
      Young, Steve  and
      Purver, Matthew",
    booktitle = "Proceedings of the {SIGDIAL} 2009 Conference",
    month = sep,
    year = "2009",
    address = "London, UK",
    publisher = "Association for Computational Linguistics",
    url = "https://preview.aclanthology.org/fix-sig-urls/W09-3916/",
    pages = "120--123"
}