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Härkönen, S.: Digital Reference Konsortien : Kooperative Online-Auskunft in Bibliotheken (2007)
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Nicholas, D.: Assessing information needs : tools, techniques and concepts for the Internet age (2000)
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Lipow, A.G.: ¬The virtual reference librarian's handbook (2003)
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Nicholas, D.: Assessing information needs : tools, techniques and concepts for the Internet age (2000)
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Härkönen, S.: Bibliothekarischer Auskunftsdienst im Informationsverbund : Digital Reference Konsortien in den USA (2003)
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Brennscheidt, A.: AskA-Services : Nicht-bibliothekarische Informationsdienstleister im Internet (2003)
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