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Data source
- Crossref[remove]21,480
- Web of Science (Lite)16,146
- Europe PubMed Central6,948
- PubMed6,780
- Manual2,498
- METADATA.UB1,605
- arXiv1,017
- OPENSCIENCE.UB1,006
- DBLP590
- MLA58
- RePEc43
- Google Books20
- CiNii EN9
- CiNii JP7