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Chung, E.-K.; Miksa, S.; Hastings, S.K.: ¬A framework of automatic subject term assignment for text categorization : an indexing conception-based approach (2010)
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Sigel, A.: How can user-oriented depth analysis be constructively guided? (2000)
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Hjoerland, B.: ¬The concept of 'subject' in information science (1992)
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Langridge, D.W.: Subject analysis : principles and procedures (1989)
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