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Ayres, F.H.; Nielsen, L.P.S.; Ridley, M.J.: Bibliographic management : a new approach using the manifestations concept and the Bradford OPAC (1996)
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Ridley, M.J.: ¬An expert system for quality control and duplicate detection in bibliographic databases (1992)
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Ayres, F.H.; Ridley, M.J.: BOPAC2 : a new dimension in OPAC display (1999)
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