@inproceedings{riloff-etal-2006-feature,
    title = "Feature Subsumption for Opinion Analysis",
    author = "Riloff, Ellen  and
      Patwardhan, Siddharth  and
      Wiebe, Janyce",
    editor = "Jurafsky, Dan  and
      Gaussier, Eric",
    booktitle = "Proceedings of the 2006 Conference on Empirical Methods in Natural Language Processing",
    month = jul,
    year = "2006",
    address = "Sydney, Australia",
    publisher = "Association for Computational Linguistics",
    url = "https://aclanthology.org/W06-1652/",
    pages = "440--448"
}