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Data source
- CiNii EN12
- CiNii JP10
- Crossref21,053
- DBLP758
- Europe PubMed Central7,046
- Google Books644
- METADATA.UB6,781
- MLA205
- Manual10,080
- OPENSCIENCE.UB1,122
- PubMed6,868
- RePEc112
- Web of Science (Lite)16,682
- arXiv4,919