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Kunz, M.: Weiterentwicklung der SWD (1997)
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Winship, I.R.: World Wide Web searching tools : an evaluation (1995)
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Matrix of WWW indices : a comparison of Internet indexing tools (1995)
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Grasso, L.L.; Wahlig, H.: Google und seine Suchparameter : Eine Top 20-Precision Analyse anhand repräsentativ ausgewählter Anfragen (2005)
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