@inproceedings{luo-etal-2013-reducing,
    title = "Reducing Annotation Effort on Unbalanced Corpus based on Cost Matrix",
    author = "Luo, Wencan  and
      Litman, Diane  and
      Chan, Joel",
    editor = "Louis, Annie  and
      Socher, Richard  and
      Hockenmaier, Julia  and
      Ringger, Eric K.",
    booktitle = "Proceedings of the 2013 {NAACL} {HLT} Student Research Workshop",
    month = jun,
    year = "2013",
    address = "Atlanta, Georgia",
    publisher = "Association for Computational Linguistics",
    url = "https://aclanthology.org/N13-2002/",
    pages = "8--15"
}