@inproceedings{yu-hatzivassiloglou-2003-towards,
    title = "Towards Answering Opinion Questions: Separating Facts from Opinions and Identifying the Polarity of Opinion Sentences",
    author = "Yu, Hong  and
      Hatzivassiloglou, Vasileios",
    booktitle = "Proceedings of the 2003 Conference on Empirical Methods in Natural Language Processing",
    year = "2003",
    url = "https://preview.aclanthology.org/jlcl-multiple-ingestion/W03-1017/",
    pages = "129--136"
}