Cindy Azzopardi Leif Azzopardi Mark Baillie Ralf Bierig Emma Nicol Ian Ruthven Scott Sweeney Contextual Information and Assessor Characteristics in Complex Question Answering. 2006 TREC http://trec.nist.gov/pubs/trec15/papers/ustrathclyde.qa.final.pdf conf/trec/2006 db/conf/trec/trec2006.html#AzzopardiABBNRS06