Towards Answering Opinion Questions: Separating Facts from Opinions and Identifying the Polarity of Opinion Sentences Hong Yu author Vasileios Hatzivassiloglou author 2003 text Proceedings of the 2003 Conference on Empirical Methods in Natural Language Processing conference publication yu-hatzivassiloglou-2003-towards https://aclanthology.org/W03-1017/ 2003 129 136