Permalink by Leonidas Oikonomou from Noun Project
A persistent identifier (PID) is a long-lasting reference to a digital object or resource, such as a dataset, publication, or software. PIDs are used to provide a stable, unique and persistent way to identify digital objects and resources over time, regardless of where they are located or how they are accessed.
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DataCitePublish, Identify, and cite data sets using digital object identifiers (doi) | Free, Academic LicensingBrowser | 
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Persistent Identifiers |