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Lin, Z.; Baoming, Z.: Comparative study of WWW search tools (1998)
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Lowery, J.: Online bibliographic services from The British Library's National Bibliographic Service (1997)
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Cree, J.S.; LeBruin, R.: ¬The search for the best engine (1998)
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Heery, R.; Carpenter, L.; Day, M.: Renardus project developments and the wider digital library context (2001)
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