This will require having all references stored in the database as well as creating reference identity and deduplicating references. I think we don't have anything like that do we? This is a way larger piece of work than all the rest of the requirements which could be implemented just by parsing the articles.
Talk:Core Platform Team/Initiatives/References API
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As far as I know, this is what the Shared Citations proposal by @LWyatt (WMF) is about.
We already have an endpoint in RESTBase implemented via the page content service that returs references from the page: https://en.wikipedia.org/api/rest_v1/#/Page%20content/getContent-references
AFAIK it's currently in use by the Android app. We need to coordinate with Reading infra and android teams cause duplicating this functionality seems unnaceptable.
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