Opinion and Generic Question Answering Systems: a Performance Analysis Alexandra Balahur author Ester Boldrini author Andrés Montoyo author Patricio Martínez-Barco author 2009-08 text Proceedings of the ACL-IJCNLP 2009 Conference Short Papers Keh-Yih Su editor Jian Su editor Janyce Wiebe editor Haizhou Li editor Association for Computational Linguistics Suntec, Singapore conference publication balahur-etal-2009-opinion https://aclanthology.org/P09-2040/ 2009-08 157 160