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Chang, R.: Keyword searching and indexing (1993)
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Yang, C.C.; Lin, J.; Wei, C.-P.: Retaining knowledge for document management : category-tree integration by exploiting category relationships and hierarchical structures (2010)
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Falk, H.: Computer-based vertical files (1996)
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Bronson, R.J.: MeSH chemical headings and pharmacologic action (1997)
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Woodward, J.: Cataloging and classifying information resources on the Internet (1996)
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