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Kelley, D.: Relevance feedback : getting to know your user (2008)
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St.Clair, G.: Knowledge management for OPLs? : Why not? (1998)
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Rusch-Feja, D.; Becker, H.J.: Global Info : the German digital libraries project (1999)
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Rice, R.: Putting sample indexes on your Web site (2000)
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Balas, J.: ¬The importance of mastering search engines (1998)
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