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Clarke, S.J.; Willett, P.: Estimating the recall performance of Web search engines (1997)
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Mettrop, W.; Nieuwenhuysen, P.: Internet search engines : fluctuations in document accessibility (2001)
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Griesbaum, J.; Rittberger, M.; Bekavac, B.: Deutsche Suchmaschinen im Vergleich : AltaVista.de, Fireball.de, Google.de und Lycos.de (2002)
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