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Data source
- Crossref[remove]21,575
- Web of Science (Lite)16,193
- Europe PubMed Central6,981
- PubMed6,802
- Manual2,515
- METADATA.UB1,605
- arXiv1,017
- OPENSCIENCE.UB1,013
- DBLP592
- MLA58
- RePEc43
- Google Books21
- CiNii EN9
- CiNii JP7