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Fryxell, D.A.: ¬9 Web search sites examined (1996)
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Courlois, M.P.: Cool tools for Web searching : an update (1996)
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Lin, Z.; Baoming, Z.: Comparative study of WWW search tools (1998)
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Zurawski, A.: Fit fürs Netz : alles über Suchmaschinen (1997)
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Notess, G.R.: Measuring the size of Internet databases (1997)
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