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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.: ¬The free language approach to online catalogues (1985)
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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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Richardson, A.: Recent developments at SilverPlatter (1997)
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WinSPIRS 4.0 in general release (1999)
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