A Graph-based Semi-Supervised Learning for Question-Answering Asli Celikyilmaz author Marcus Thint author Zhiheng Huang author 2009-08 text Proceedings of the Joint Conference of the 47th Annual Meeting of the ACL and the 4th International Joint Conference on Natural Language Processing of the AFNLP Keh-Yih Su editor Jian Su editor Janyce Wiebe editor Haizhou Li editor Association for Computational Linguistics Suntec, Singapore conference publication celikyilmaz-etal-2009-graph https://aclanthology.org/P09-1081/ 2009-08 719 727