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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.: Ranganathan in the perspective of advanced information retrieval (1992)
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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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Billhardt, H.; Borrajo, D.; Maojo, V.: ¬A context vector model for information retrieval (2002)
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¬The Fourth Text Retrieval Conference (TREC-4) (1996)
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