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Richardson, J.V.: Knowledge-based systems for general reference work : applications, problems, and progress (1995)
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Richardson, D.: Just the facts (1996)
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Richardson, J.V.: Question master : an evaluation of a Web-based decision-support system for use in reference environments (1998)
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Hjoerland, B.: Is classification necessary after Google? (2012)
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Svenonius, E.: Ranganathan and classification science (1992)
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