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Takano, M.: OPACs in university libraries (1994)
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Beagle, D.: Visualizing keyword distribution across multidisciplinary c-space (2003)
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Voorbij, H.: Title keywords and subject descriptors : a comparison of subject search entries of books in the humanities and social sciences (1998)
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Tillotson, J.: Is keyword searching the answer? (1995)
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Pienaar, R.E.: Enhancement of subject access in online public access catalogues (OPACs) (1989)
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