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Doi
https://www.doi.org/the-identifier/what-is-a-doi/
similar:
Purl
see
https://www.doi.org/the-identifier/resources/factsheets/doi-system-and-persistent-urls
managed-by:
Doi Foundation
Issues
registration agencies charge money
e.g.
https://www.crossref.org/fees/
References
https://www.doi.org/the-identifier/what-is-a-doi/
Issues
References