@article{wilson-etal-2009-articles,
    title = "Recognizing Contextual Polarity: An Exploration of Features for Phrase-Level Sentiment Analysis",
    author = "Wilson, Theresa  and
      Wiebe, Janyce  and
      Hoffmann, Paul",
    journal = "Computational Linguistics",
    volume = "35",
    number = "3",
    month = sep,
    year = "2009",
    address = "Cambridge, MA",
    publisher = "MIT Press",
    url = "https://preview.aclanthology.org/ingest-emnlp/J09-3003/",
    doi = "10.1162/coli.08-012-R1-06-90",
    pages = "399--433"
}