@inproceedings{riloff-wiebe-2003-learning,
    title = "Learning Extraction Patterns for Subjective Expressions",
    author = "Riloff, Ellen  and
      Wiebe, Janyce",
    booktitle = "Proceedings of the 2003 Conference on Empirical Methods in Natural Language Processing",
    year = "2003",
    url = "https://aclanthology.org/W03-1014/",
    pages = "105--112"
}