Valentin Jijkoun Katja Hofmann David Ahn Mahboob Alam Khalid Joris van Rantwijk Maarten de Rijke Erik F. Tjong Kim Sang The University of Amsterdam's Question Answering System at QA@CLEF 2007. 344-351 2007 CLEF http://dx.doi.org/10.1007/978-3-540-85760-0_43 conf/clef/2007 db/conf/clef/clef2007.html#JijkounHAKRRS07