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Data source
- CiNii EN12
- CiNii JP10
- Crossref21,509
- DBLP913
- Europe PubMed Central7,094
- Google Books648
- METADATA.UB7,078
- MLA217
- Manual10,363
- OPENSCIENCE.UB1,139
- PubMed6,925
- RePEc112
- Web of Science (Lite)17,042
- arXiv5,085