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Wormell, I.: SAP: a new way to produce subject description of books (1981)
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Wormell, I.: Subject access project - SAP : Improved subject retrieval for monographic publications (1985)
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Wormell, I.: Factual data retrieval according to SAP technique (1983)
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Wormell, I.: Subject access redefinied : how new technology changes the conception of subject representation (1994)
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Wormell, I.: Subject Access Project : the use of book indexes for subject retrieval systems in libraries (1981)
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Chowdhury, G.G.: Record formats for integrated databases : a review and comparison (1996)
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Stempfhuber, M.; Zapilko, B.: Modelling text-fact-integration in digital libraries (2009)
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Koch, T.: Information mapping : a glimpse at the future (1993)
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Plath, M.: ¬The concept of the literature and factual data management system LIMAS (1996)
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Connell, T.H.: Subject searching in online catalogs : metaknowledge used by experienced searchers (1995)
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