@InProceedings{nakagawa-inui-kurohashi:2010:NAACLHLT,
  author    = {Nakagawa, Tetsuji  and  Inui, Kentaro  and  Kurohashi, Sadao},
  title     = {Dependency Tree-based Sentiment Classification using CRFs with Hidden Variables},
  booktitle = {Human Language Technologies: The 2010 Annual Conference of the North American Chapter of the Association for Computational Linguistics},
  month     = {June},
  year      = {2010},
  address   = {Los Angeles, California},
  publisher = {Association for Computational Linguistics},
  pages     = {786--794},
  url       = {http://www.aclweb.org/anthology/N10-1120}
}