@InProceedings{druck-settles-mccallum:2009:EMNLP,
  author    = {Druck, Gregory  and  Settles, Burr  and  McCallum, Andrew},
  title     = {Active Learning by Labeling Features},
  booktitle = {Proceedings of the 2009 Conference on Empirical Methods in Natural Language Processing},
  month     = {August},
  year      = {2009},
  address   = {Singapore},
  publisher = {Association for Computational Linguistics},
  pages     = {81--90},
  url       = {http://www.aclweb.org/anthology/D/D09/D09-1009}
}