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Heidenreich, F.: Know your search engine : a comparison of 6 popular Web search engines (1997)
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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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Venditto, G.: Search engine showdown : IW Labs tests seven Internet search tools (1996)
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Cree, J.S.; LeBruin, R.: ¬The search for the best engine (1998)
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