@inproceedings{ren-etal-2013-dialog,
    title = "Dialog State Tracking using Conditional Random Fields",
    author = "Ren, Hang  and
      Xu, Weiqun  and
      Zhang, Yan  and
      Yan, Yonghong",
    editor = "Eskenazi, Maxine  and
      Strube, Michael  and
      Di Eugenio, Barbara  and
      Williams, Jason D.",
    booktitle = "Proceedings of the {SIGDIAL} 2013 Conference",
    month = aug,
    year = "2013",
    address = "Metz, France",
    publisher = "Association for Computational Linguistics",
    url = "https://preview.aclanthology.org/fix-sig-urls/W13-4071/",
    pages = "457--461"
}