@InProceedings{sun-grishman-sekine:2011:ACL-HLT2011,
  author    = {Sun, Ang  and  Grishman, Ralph  and  Sekine, Satoshi},
  title     = {Semi-supervised Relation Extraction with Large-scale Word Clustering},
  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     = {521--529},
  url       = {http://www.aclweb.org/anthology/P11-1053}
}