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Collier, H.: Needles in electronic haystacks (1996)
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Spear, B.: Patent information on the Internet (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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Webber, S.: Search engines and news services : developments on the Internet (1998)
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Bjorner, S.: Let your fingers do the searching : call for the fax (1993)
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