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Data source
- Crossref21,417
- Web of Science (Lite)16,992
- Manual10,304
- Europe PubMed Central7,081
- METADATA.UB7,078
- PubMed6,913
- arXiv5,055
- OPENSCIENCE.UB1,133
- DBLP911
- Google Books637
- MLA217
- RePEc112
- CiNii EN12
- CiNii JP10