“Persistent Identifiers: The ‘URN Granular’ Project of the German National Library and the University and State Library Halle”. LIBER Quarterly: The Journal of the Association of European Research Libraries 19, no. 3-4 (February 9, 2010): 259–274. Accessed November 23, 2024. https://testplatform.openjournals.nl/liberquarterly/article/view/10561.