Mark Baillie David Elsweiler Emma Nicol Ian Ruthven Simon O. Sweeney Murat Yakici Fabio Crestani Monica Landoni University of Strathclyde at TREC HARD. 2005 TREC http://trec.nist.gov/pubs/trec14/papers/ustrathclyde.hard.pdf conf/trec/2005 db/conf/trec/trec2005.html#BaillieENRSYCL05