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Data source
- CiNii EN12
- CiNii JP10
- Crossref23,449
- DBLP914
- Europe PubMed Central7,125
- Google Books658
- METADATA.UB26,694
- MLA219
- Manual10,422
- OPENSCIENCE.UB9,330
- PubMed6,951
- RePEc112
- Web of Science (Lite)17,093
- arXiv5,116