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Data source
- CiNii EN9
- CiNii JP7
- Crossref[remove]21,047
- DBLP470
- Europe PubMed Central6,900
- Google Books20
- METADATA.UB1,489
- MLA56
- Manual2,450
- OPENSCIENCE.UB1,006
- PubMed6,726
- RePEc43
- Web of Science (Lite)15,840
- arXiv1,000