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Langridge, D.W.: Subject analysis : principles and procedures (1989)
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Koch, T.: Quality-controlled subject gateways : definitions, typologies, empirical overview (2000)
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Allen, R.B.: ¬Two digital library interfaces that exploit hierarchical structure (1995)
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Cheng, P.T.K.; Wu, A.K.W.: ACS: an automatic classification system (1995)
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Gödert, W.: Klassifikatorische Inhaltserschließung : Ein Übersichtsartikel als kommentierter Literaturbericht (1990)
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