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Dumais, S.T.; Belkin, N.J.: ¬The TREC interactive tracks : putting the user into search (2005)
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Murdock, V.; Kelly, D.; Croft, W.B.; Belkin, N.J.; Yuan, X.: Identifying and improving retrieval for procedural questions (2007)
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Li, Y.; Belkin, N.J.: ¬A faceted approach to conceptualizing tasks in information seeking (2008)
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