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Ingwersen, P.; Wormell, I.: Means to improve subject access and representation in modern information retrieval (1988)
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Ingwersen, P.; Wormell, I.: Modern indexing and retrieval techniques matching different types of information needs (1989)
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Wormell, I.: SAP: a new way to produce subject description of books (1981)
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Wormell, I.: Factual data retrieval according to SAP-technique (1983)
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Wormell, I.: Subject access project - SAP : Improved subject retrieval for monographic publications (1985)
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Kashyap, M.M.: Likeness between Ranganathan's postulations based approach to knowledge classification and entity relationship data modelling approach (2003)
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Smeaton, A.F.: Progress in the application of natural language processing to information retrieval tasks (1992)
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Grimaldi, T.: ¬L'indicizzazione dal punto di vista cognitivo (II) (1996)
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