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Data source
- CiNii EN12
- CiNii JP10
- Crossref20,873
- DBLP355
- Europe PubMed Central6,981
- Google Books2
- METADATA.UB10,727
- MLA94
- Manual4,330
- OPENSCIENCE.UB2,983
- PubMed6,926
- RePEc57
- Web of Science (Lite)15,942
- arXiv1,190