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Liu, S.; Svenonius, E.: DORS: DDC online retrieval system (1991)
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Moore, A.: As I sit studying : WWW-based reference services (1998)
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New technologies and reference services (2000)
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Davies, D.; Hepworth, M.: PC-based interfaces to online information services and the development of FT Profile's Freeway (1993)
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Koshman, S.: Comparing usability between a visualization and text-based system for information retrieval (2004)
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