Robert J. Gaizauskas Mark A. Greenwood Henk Harkema Mark Hepple Horacio Saggion Atheesh Sanka The University of Sheffield's TREC 2005 Q&A Experiments. 2005 TREC http://trec.nist.gov/pubs/trec14/papers/usheffield.qa.pdf conf/trec/2005 db/conf/trec/trec2005.html#GaizauskasGHHSS05