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Wills, R.S.: Google's PageRank : the math behind the search engine (2006)
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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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Spink, A.; Ozmultu, H.C.: Characteristics of question format web queries : an exploratory study (2002)
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Lewandowski, D.: Evaluating the retrieval effectiveness of web search engines using a representative query sample (2015)
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