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French, J.C.; Brown, D.E.; Kim, N.-H.: ¬A classification approach to Boolean query reformulation (1997)
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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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Ruiz, M.E.; Srinivasan, P.: Combining machine learning and hierarchical indexing structures for text categorization (2001)
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Diaz, I.; Morato, J.; Lioréns, J.: ¬An algorithm for term conflation based on tree structures (2002)
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