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Data source
- Crossref10,278
- Web of Science (Lite)8,450
- Manual4,466
- METADATA.UB3,669
- Europe PubMed Central3,568
- PubMed3,515
- arXiv2,564
- DBLP473
- OPENSCIENCE.UB327
- Google Books318
- MLA120
- RePEc46
- CiNii EN1
- CiNii JP1