A Generative Blog Post Retrieval Model that Uses Query Expansion based on External Collections Wouter Weerkamp author Krisztian Balog author Maarten de Rijke 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 weerkamp-etal-2009-generative https://aclanthology.org/P09-1119/ 2009-08 1057 1065