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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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Chu, H.; Rosenthal, M.: Search engines for the World Wide Web : a comparative study and evaluation methodology (1996)
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Fife, E.D.; Husch, L.: ¬The Mathematics Archives : making mathematics easy to find on the Web (1999)
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