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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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Ingwersen, P.; Wormell, I.: Ranganathan in the perspective of advanced information retrieval (1992)
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