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Fryxell, D.A.: ¬9 Web search sites examined (1996)
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Liu, H.-M.C.: Selection and comparison of WWW search tools (1996)
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Internet search tool details (1996)
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Lin, Z.; Baoming, Z.: Comparative study of WWW search tools (1998)
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Duval, B.K.; Main, L.: Searching on the Net : general overview (1996)
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