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Ruthven, Ian and Baillie, Mark and Azzopardi, Leif and Bierig, Ralf and Nicol, Emma and Sweeney, Simon and Yaciki, Murat (2008) Contextual factors affecting the utility of surrogates within exploratory search. Information Processing and Management, 44 (2). pp. 437-462. ISSN 0306-4573