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Richardson, E.C.: Classification: theoretical and practical (1964)
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Richardson, J.: Pointing the index finger (1994)
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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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Fogarty, E.: Reference questions : who, what, where, when, how and why? (1995)
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Li, J.; Wu, G.: Characteristics of reference transactions : challenges to librarian's roles (1998)
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Chen, C.: Visualizing scientific paradigms : an introduction (2003)
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