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Overton, R.: Search engines get faster and faster, but not always better (1996)
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Sullivan D.: ¬The webmaster's guide to search engines and directories (1996)
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Hsieh-Yee, I.: ¬The retrieval power of selected search engines : how well do they address general reference questions and subject questions? (1998)
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Edelman, B.: Assessing and improving the safety of Internet search engines (2007)
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Zorn, P.: Advanced web searching : tricks of the trade (1996)
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