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Data source
- CiNii EN6
- CiNii JP4
- Crossref3,984
- DBLP246
- Europe PubMed Central1,266
- Google Books126
- METADATA.UB9,120
- MLA86
- Manual2,053
- OPENSCIENCE.UB1,657
- PubMed1,253
- RePEc54
- Web of Science (Lite)3,305
- arXiv1,073