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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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Internet search tool details (1996)
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Liu, H.-M.C.: Selection and comparison of WWW search tools (1996)
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Feldman, S.: "Just the answer, please" : choosing a Web search service (1997)
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