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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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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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Bookstein, A.; Wright, B.: Ambiguity in measurement (1997)
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Harbourt, A.M.; Knecht, L.S.: Structured abstracts in MEDLINE, 1989-1991 (1995)
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Hancock-Beaulieu, M.: Methods for evaluating OPACs (1990)
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Adler, P.S.: ¬An introduction : where are we heading? (1997)
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Baeza-Yates, R.; Navarro, G.: Block addressing indices for approximate text retrieval (2000)
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