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Clarke, S.J.; Willett, P.: Estimating the recall performance of Web search engines (1997)
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Feldman, S.: Search Engine Watch : an outstanding and useful meta site (1997)
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Bar-Ilan, J.: Comparing rankings of search results on the Web (2005)
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Garnsey, M.R.: What distance learners should know about information retrieval on the World Wide Web (2002)
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Peterson, R.E.: Eight Internet search engines compared (1996)
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