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Croft, W.B.: Combining approaches to information retrieval (2000)
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Shneiderman, B.; Byrd, D.; Croft, W.B.: Clarifying search : a user-interface framework for text searches (1997)
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Croft, W.B.; Metzler, D.; Strohman, T.: Search engines : information retrieval in practice (2010)
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