@inproceedings{bohus-horvitz-2009-learning,
    title = "Learning to Predict Engagement with a Spoken Dialog System in Open-World Settings",
    author = "Bohus, Dan  and
      Horvitz, Eric",
    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/ingest_wac_2008/W09-3935/",
    pages = "244--252"
}