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Hengel-Dittrich, C.: Persistent Identifier für digitale Ressourcen (2000)
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Shafer, K.E.; Weibel, S.L.; Jul, E.: ¬The PURL Project (2001)
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Schroeder, K.: Persistant identifiers im Kontext von Metadaten (2003)
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Deutsche Bibliothek: Eindeutige Kennung für Aufsätze im Internet (2004)
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Schroeder, K.: Persistent Identifiers im Kontext der Langzeitarchivierung : EPICUR auf dem 2. Bibliothekskongress in Leipzig (2004)
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