@conference {somasundaran:emnlp09, title = {Supervised and Unsupervised Methods in Employing Discourse Relations for Improving Opinion Polarity Classification}, booktitle = {Conference on Empirical Methods in Natural Language Processing}, year = {2009}, month = {August}, author = {Somasundaran, Swapna and Namata, Galileo Mark and Wiebe, Janyce and Lise Getoor} }