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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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Notess, G.R.: Measuring the size of Internet databases (1997)
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Tomaiuolo, N.G.; Packer, J.G.: ¬An analysis of Internet search engines : assessment of over 200 search queries (1996)
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