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Duval, B.K.; Main, L.: Searching on the Net : general overview (1996)
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Collier, H.: Needles in electronic haystacks (1996)
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Machovec, G.S.: World Wide Web search engines : Open Text, Harvest, 2ASK (1996)
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Liu, H.-M.C.: Selection and comparison of WWW search tools (1996)
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Bar-Ilan, J.: Evaluating the stability of the search tools Hotbot and Snap : a case study (2000)
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