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Walker, S.: Okapi : Evaluating and enhancing an experimental online catalog (1987)
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Walker, S.: Ease of use in online catalogues : a plea for the user (1986)
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Walker, S.: ¬Der Mensch-Maschine-Dialog bei Online-Benutzer-Katalogen (1987)
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Walker, R.: Categorization
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Walker, S.: Views on classification as a search tool on a computer (1991)
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Vasiljev, A.: Online subject access to library holdings (1986)
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Mealia, A.; Jenkins, C.: COPAC service (1997)
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Hytelnet version 6.7 available free : library navigation on the Internet (1994)
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Fattahi, R.: ¬A comparison between the online catalogue and the card catalogue : some considerations for redesigning bibliographic standards (1995)
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