@inproceedings{druck-etal-2009-active,
    title = "Active Learning by Labeling Features",
    author = "Druck, Gregory  and
      Settles, Burr  and
      McCallum, Andrew",
    editor = "Koehn, Philipp  and
      Mihalcea, Rada",
    booktitle = "Proceedings of the 2009 Conference on Empirical Methods in Natural Language Processing",
    month = aug,
    year = "2009",
    address = "Singapore",
    publisher = "Association for Computational Linguistics",
    url = "https://preview.aclanthology.org/jlcl-multiple-ingestion/D09-1009/",
    pages = "81--90"
}