@inproceedings{Yu-Hatzivassiloglou:2003:EMNLP,
  author = {Yu, Hong  and  Hatzivassiloglou, Vasileios},
  title  = {Towards Answering Opinion Questions: Separating Facts from Opinions and Identifying the Polarity of Opinion Sentences},
  booktitle = {Proceedings of the 2003 Conference on Empirical Methods in Natural Language Processing},
  editor = {Michael Collins and Mark Steedman},
  url    = {http://www.aclweb.org/anthology/W03-1017.pdf},
  year   = 2003,
  pages  = {129--136}