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Fryxell, D.A.: ¬9 Web search sites examined (1996)
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Venditto, G.: Search engine showdown : IW Labs tests seven Internet search tools (1996)
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Tomaiuolo, N.G.; Packer, J.G.: Quantitative analysis of five WWW 'search engines' (1996)
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Hock, R.E.: How to do field searching in Web search engines : a field trip (1998)
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