The Wikimedia Foundation has released How Many Wikipedia References Are Available to Read? We Measured The Proportion of Open Access Sources Across Languages and Topics..
Here's an excerpt:
We recently released a dataset of all citations with identifiers in Wikipedia. . . .
To create this dataset, we cross-referenced our existing data with data provided by Unpaywall, a database gathering accessibility information of more than 19 million articles, and we associated each scholarly publication’s digital object identifier (DOI) cited in Wikipedia with an accessibility label: "Open" if the publisher (source) provides a free copy, "Closed" if it is a paywalled publication, or "Available" if the official version is paywalled but there exists an open copy available elsewhere on the web (e.g., legally deposited by the author in a university repository). In total, we gathered accessibility values for around 450,000 scholarly publications cited across 300 Wikipedia languages.[2]
We find that less than half of the official versions of scholarly publications cited with an identifier in Wikipedia are freely available on the web: 29% are free-to-read at the source, while an additional 10% have a free-to-read version available elsewhere.[3]
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