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  1. Horwood, C.A.: Online public access catalogues : OPACs in Germany (1991) 0.04 
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  2. Chen, X.: Indexing consistency between online catalogues (2008) 0.02 
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  3. Oberhauser, O.: Card-Image Public Access Catalogues (CIPACs) : a critical consideration of a cost-effective alternative to full retrospective catalogue conversion (2002) 0.01 
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