[Hilse]

Hilse, H., Kothe, J., [Implementing Persistent Identifiershttp://www.knaw.nl/ecpa/publ/pdf/2732.pdf], KNAW, [http://www.knaw.nl/ecpa/publ/pdf/2732.pdfhttp://www.knaw.nl/ecpa/publ/pdf/2732.pdf]

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[Tonkin]

Tonkin, E., Persistent Identifers: Considering the Options, Ariadne, issue 56, [http://www.ariadne.ac.uk/issue56/tonkin/http://www.ariadne.ac.uk/issue56/tonkin/] ]]></ac:plain-text-body></ac:structured-macro>

CNRI

http://www.cnri.reston.va.us/