%0 Journal Article %T Articles: Recognizing Contextual Polarity: An Exploration of Features for Phrase-Level Sentiment Analysis %A Wilson, Theresa %A Wiebe, Janyce %A Hoffmann, Paul %J Computational Linguistics %D 2009 %8 September %V 35 %N 3 %I MIT Press %C Cambridge, MA %F wilson-etal-2009-articles %R 10.1162/coli.08-012-R1-06-90 %U https://aclanthology.org/J09-3003 %U https://doi.org/10.1162/coli.08-012-R1-06-90 %P 399-433