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Gyseghem, N. van; Caluwe, R. de: Imprecision and uncertainty in the UFO database model (1998)
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Taylor, D.: Object-oriented information systems : planning and implementation (1993)
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Ibekwe-SanJuan, F.: Semantic metadata annotation : tagging Medline abstracts for enhanced information access (2010)
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Towell, E.; Haseman, W.D.: Semantic resolution in multi-database environment (1995)
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