Supervised and Unsupervised Methods in Employing Discourse Relations for Improving Opinion Polarity Classification Swapna Somasundaran author Galileo Namata author Janyce Wiebe author Lise Getoor author 2009-08 text Proceedings of the 2009 Conference on Empirical Methods in Natural Language Processing Philipp Koehn editor Rada Mihalcea editor Association for Computational Linguistics Singapore conference publication somasundaran-etal-2009-supervised https://aclanthology.org/D09-1018/ 2009-08 170 179