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Avi Shah
Ability to cite using DOI or Journal title.
Agencies: https://www.doi.org/registration_agencies.html
http://data.europa.eu/euodp/en/developerscorner
CrossRef: https://github.com/CrossRef/rest-api-doc and https://www.crossref.org/services/metadata-delivery/rest-api/
DataCite:
mEDRA: https://www.programmableweb.com/api/medra