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Data source
- CiNii EN9
- CiNii JP7
- Crossref[remove]23,402
- DBLP590
- Europe PubMed Central6,969
- Google Books20
- METADATA.UB1,917
- MLA58
- Manual2,506
- OPENSCIENCE.UB2,877
- PubMed6,801
- RePEc43
- Web of Science (Lite)16,193
- arXiv1,019