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Kimmel, S.: Robot-generated databases on the World Wide Web (1996)
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Notess, G.R.: Searching the World-Wide Web : Lycos, WebCrawler and more (1995)
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World Wide Web search engines : Inktomi Corporation (1996)
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Hancock, B.: Subject-specific search engines : using the Harvest system to gather and maintain information on the Internet (1998)
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Watson, I.: Internet, intranet, extranet : managing the information bazaar (1999)
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