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Data source
- CiNii EN12
- CiNii JP10
- Crossref23,392
- DBLP913
- Europe PubMed Central7,111
- Google Books655
- METADATA.UB26,694
- MLA219
- Manual10,381
- OPENSCIENCE.UB9,320
- PubMed6,941
- RePEc112
- Web of Science (Lite)17,070
- arXiv5,109