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Ulrich, P.S.: Collaborative Digital Reference Service : Weltweites Projekt (2001)
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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.: Einsatz und Erfahrungen mit QuestionPoint in der Zentral- und Landesbibliothek Berlin (2004)
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