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Ansari, M.A.A.: Awareness and use of OPACs in five Delhi libraries (2008)
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Söderholm, G.: OPAC user study : Stockholm University Library (1991)
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Voshida, K.: ¬A study on improving subject access to the OPAC : a survey of catalogue use comparing an OPAC and a card catalogue in a private university library (1994)
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Alexander, B.B.; Gyeszly, S.D.: OPAC or card catalog : patrons preference in an academic library (1991)
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Park, I.K.: Comparing major U.S. OPAC systems for developing countries (1997)
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