«Implementing Persistent Identifiers: Overview of concepts, guidelines and recommendations / Hans-Werner Hilse and Jochen Kothe» (2007) DigItalia, 2(1), pagg. 167–168. Available at: https://digitalia-ojs35-test.archicoop.it/index.php/digitalia/article/view/420 (Consultato: 29 aprile 2026).