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Araghi, G.F.: Major problems in retrieval systems (2005)
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Altinel, B.; Ganiz, M.C.: Semantic text classification : a survey of past and recent advances (2018)
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Herget, J.: Meta-information systems : how can they support corporate information management? (1994)
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Van der Walt, M.S.: Ethics in indexing and clssification (2006)
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