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Bell, S.S.: Librarian's guide to online searching (2006)
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Huerster, B.: Indexing for PAIS International (1989)
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Jun, W.: ¬A knowledge network constructed by integrating classification, thesaurus and metadata in a digital library (2003)
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Smith, A.G.: Search features of digital libraries (2000)
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Northern Light bridges two worlds : innovative search service expands possibilities for ordinary Web users (1998)
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