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Data source
- Crossref[remove]2,503
- Manual[remove]2,503
- Web of Science (Lite)1,050
- Europe PubMed Central393
- PubMed388
- arXiv327
- METADATA.UB135
- DBLP100
- OPENSCIENCE.UB44
- MLA13
- Google Books8
- RePEc3
- CiNii EN2
- CiNii JP2