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Lynch, C.: Identifiers and their role in networked information applications (1998)
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Rusch-Feja, D.D.: Metadaten zur Erschließung digitaler Ressourcen und PURL (1997)
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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.: Persistent Identifiers im Kontext der Langzeitarchivierung : EPICUR auf dem 2. Bibliothekskongress in Leipzig (2004)
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