closed = article only accessible with subscription to journal
gold = open access article in full open access journal
hybrid = open access article in subscription journal
publisher = free access to article in subscription journal granted by publisher
repository = free accessible version of subscription journal article in repository
open access = author retains copyright, published under creative commons license (free to use)
Open access metadata from (peer) reviewed publications with a doi in unpaywall. Open access status is highly changeable. The data presented here has been harvested from unpaywall during Easter 2019.
Number of pubs per year list