DOI
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Academic papers 3
- Crossref REST API The official registry behind journal-article DOIs, authoritative metadata (title, authors, journal, references) for ~165M scholarly works. Look up a DOI or a title. Open
- DataCite REST API The DOI registry for research outputs beyond papers, datasets, software and preprints, with their citation metadata. Open
- Sci-Hub Opens the full-text PDF of a paywalled research paper from its DOI; the corpus is large but largely frozen around 2021. Links to copyrighted papers; opens externally. may require captcha Open