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Thelwall, M.; Sud, P.: ¬A comparison of methods for collecting web citation data for academic organizations (2011)
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Thelwall, M.: Quantitative comparisons of search engine results (2008)
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Vaughan, L.: New measurements for search engine evaluation proposed and tested (2004)
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Bar-Ilan, J.: On the overlap, the precision and estimated recall of search engines : a case study of the query 'Erdös' (1998)
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Bilal, D.: Ranking, relevance judgment, and precision of information retrieval on children's queries : evaluation of Google, Yahoo!, Bing, Yahoo! Kids, and ask Kids (2012)
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