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Mueller, C.; Steinhagen, E.: Multilingual records in WorldCat (2003)
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Egger-Sider, F.; Devine, J.: Google, the Invisible Web, and librarians : slaying the research goliath (2005)
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Hill, J.S.: Is it worth it? : management issues related to database quality (2008)
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Fuld, L.M.: Will today's databases survive : a question of value (1996)
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Berry, M.W.; Browne, M.: Understanding search engines : mathematical modeling and text retrieval (2005)
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