@InProceedings{liao-grishman:2011:ACL-HLT2011,
  author    = {Liao, Shasha  and  Grishman, Ralph},
  title     = {Can Document Selection Help Semi-supervised Learning? A Case Study On Event Extraction},
  booktitle = {Proceedings of the 49th Annual Meeting of the Association for Computational Linguistics: Human Language Technologies},
  month     = {June},
  year      = {2011},
  address   = {Portland, Oregon, USA},
  publisher = {Association for Computational Linguistics},
  pages     = {260--265},
  url       = {http://www.aclweb.org/anthology/P11-2045}
}