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Ulrich, P.S.: Collaborative Digital Reference Service : Weltweites Projekt (2001)
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Ulrich, P.S.: ¬Die Antwort ist irgendwo da draußen... : Kooperative Auskunft mit der Mailing-Liste 'Stumper-L' - Arbeitsweise und Erfahrungen (1997)
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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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