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OPACs: an overview (1993)
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Zumer, M.; Zeng, L.: Comparison and evaluation of OPAC end-user interfaces (1994)
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Ueda, S.: Online public access catalogues (OPACs) of university libraries in Japan (1995)
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Shires, N.L.; Olszak, L.P.: What our screen should look alike : an introduction to effective PAC screens (1992)
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Hirawa, M.: Role of keywords in the network searching era (1998)
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