@InProceedings{tomanek-EtAl:2009:ALNLP,
  author    = {Tomanek, Katrin  and  Laws, Florian  and  Hahn, Udo  and  Sch\"{u}tze, Hinrich},
  title     = {On Proper Unit Selection in Active Learning: Co-Selection Effects for Named Entity Recognition},
  booktitle = {Proceedings of the NAACL HLT 2009 Workshop on Active Learning for Natural Language Processing},
  month     = {June},
  year      = {2009},
  address   = {Boulder, Colorado},
  publisher = {Association for Computational Linguistics},
  pages     = {9--17},
  url       = {http://www.aclweb.org/anthology/W09-1902}
}