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Spink, A.; Jansen, B.J.; Blakely, C.; Koshman, S.: ¬A study of results overlap and uniqueness among major Web search engines (2006)
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Hume, C.: Internet search engines and robots : what they are and how to use them (2000)
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Rudich, J.: Internet search engines on CD-ROM (1996)
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Lewandowski, D.: ¬A framework for evaluating the retrieval effectiveness of search engines (2012)
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