Richard F. E. Sutcliffe Igal Gabbay Kieran White Aoife O'Gorman Michael Mulcahy Question Answering Using the DLT System at TREC 2004. 2004 TREC http://trec.nist.gov/pubs/trec13/papers/u.limerick.qa.pdf conf/trec/2004 db/conf/trec/trec2004.html#SutcliffeGWOM04