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Data source
- Crossref[remove]20,773
- Web of Science (Lite)15,523
- Europe PubMed Central6,815
- PubMed6,766
- OPENSCIENCE.UB2,847
- Manual2,020
- METADATA.UB1,730
- arXiv999
- DBLP301
- RePEc41
- MLA39
- CiNii EN9
- CiNii JP7
- Google Books1