Documentation de l'API de CrossRef qui permet de faire plein de trucs, notamment de connaître l'agence d'enregistrement d'un DOI grâce à la requête suivante:

https://api.crossref.org/works/{ insérer votre DOI ici }/agency

exemples

https://api.crossref.org/works/10.5281/zenodo.838762/agency => Datacite

{"status":"ok","message-type":"work-agency","message-version":"1.0.0","message":{"DOI":"10.5281\/zenodo.838762","agency":{"id":"datacite","label":"DataCite"}}}

https://api.crossref.org/works/10.7287/peerj.preprints.1721/agency => CrossRef

{"status":"ok","message-type":"work-agency","message-version":"1.0.0","message":{"DOI":"10.7287\/peerj.preprints.1721","agency":{"id":"crossref","label":"Crossref"}}}

https://api.crossref.org/works/10.2785/237722/agency => Publications Office of the European Union

{"status":"ok","message-type":"work-agency","message-version":"1.0.0","message":{"DOI":"10.2785\/237722","agency":{"id":"10.SERV\/OP","label":"10.SERV\/OP"}}}

https://api.crossref.org/works/10.3233/CH-2009-1199/agency => mEDRA

{"status":"ok","message-type":"work-agency","message-version":"1.0.0","message":{"DOI":"10.3233\/ch-2009-1199","agency":{"id":"medra","label":"mEDRA"}}}

Pour info, la liste des agences d'enregistrement de DOI est ici: http://www.doi.org/registration_agencies.html