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Ulrich, P.S.: Collaborative Digital Reference Service : Weltweites Projekt (2001)
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Sauer, C.-D.; Ulrich, P.S.: Zuverlässige Brücke zu den Informationen im Netz : Von der Allgemeinen Auskunft der Amerika-Gedenkbibliothek zum Referat Informationsdienste der Zentral und Landesbibliothek Berlin (2004)
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Sauer, C.-D.; Ulrich, P.S.: Online-Dienste einer öffentliche Bibliothek : Konzeptionelle Entwicklung - Angebote - Partner (1998)
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Sauer, C.-D.; Ulrich, P.S.: "Entschuldigen Sie bitte, ich suche ..." : Die Dienstleistungen der 'Allgemeinen Information' in der Zentral- und Landesbibliothek Berlin (1998)
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Ulrich, P.S.: It works : Die Arbeit des Collaborative Digital Reference Service (CDRS) (2002)
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Ulrich, P.S.: Multilinguale kollaborative Auskunftsdienste mit QuestionPoint (2005)
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Ulrich, P.S.: Einsatz und Erfahrungen mit QuestionPoint in der Zentral- und Landesbibliothek Berlin (2004)
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