@InProceedings{weerkamp-balog-derijke:2009:ACLIJCNLP,
  author    = {Weerkamp, Wouter  and  Balog, Krisztian  and  de Rijke, Maarten},
  title     = {A Generative Blog Post Retrieval Model that Uses Query Expansion based on External Collections},
  booktitle = {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},
  month     = {August},
  year      = {2009},
  address   = {Suntec, Singapore},
  publisher = {Association for Computational Linguistics},
  pages     = {1057--1065},
  url       = {http://www.aclweb.org/anthology/P/P09/P09-1119}
}