Tracking scholarly publishing's shift toward openness (2000-2024)
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Published in a fully open access journal (e.g., PLOS ONE)
Archived in a repository (e.g., institutional repository, PubMed Central)
OA article in a subscription journal (paid APC)
Free to read on publisher site, but no open license
OA with no author fees (often society/institution funded)
Behind paywall, no open version available