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Jones, R.M.: Online catalogue research in Europe (1989)
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Ashton, J.: ONE: the final OPAC frontier (1998)
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Lau, E.P.; Goh, H.-L.: In search of query patterns : a case study of a university OPAC (2006)
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Loarer, P. le: OPAC: opaque or open, public, accessible and co-operative? : some developments in natural language processing (1993)
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Bowman, S.; Avey, F.D.; Turner, C.: ¬A comparative study of the impact of Online Public Access Catalogues on the information gathering and utilisation habits of different user groups (1991)
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