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Reference and information services : an introduction (1991)
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Reference and information services : an introduction (2001)
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Kuhlen, R.: ¬Die Konsequenzen von Informationsassistenten : was bedeutet informationelle Autonomie oder wie kann Vertrauen in elektronische Dienste in offenen Informationsmärkten gesichert werden? (1999)
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Reference and information services : an introduction (1995)
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