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Paste one or more DOIs, or any text that contains them. It lists every free, legal copy it can find, and names the author to ask when there isn't one.

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Sources: OpenAlex (it carries Unpaywall's open-access data), Europe PMC, Crossref and arXiv. Your browser asks them directly; this page stores nothing.

"Accepted" is the author's peer-reviewed manuscript before the journal's layout. A preprint was posted before or during review, so check its numbers against the published version.