@InProceedings{vanderplas-tiedemann:2008:IR4QA,
  author    = {van der Plas, Lonneke  and  Tiedemann, J\"{o}rg},
  title     = {Using Lexico-Semantic Information for Query Expansion in Passage Retrieval for Question Answering},
  booktitle = {Coling 2008: Proceedings of the 2nd workshop on Information Retrieval for Question Answering},
  month     = {August},
  year      = {2008},
  address   = {Manchester, UK},
  publisher = {Coling 2008 Organizing Committee},
  pages     = {50--57},
  url       = {http://www.aclweb.org/anthology/W08-1807}
}