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Data source
- METADATA.UB9,114
- Crossref3,983
- Web of Science (Lite)3,309
- Manual2,079
- OPENSCIENCE.UB1,657
- Europe PubMed Central1,266
- PubMed1,253
- arXiv1,078
- DBLP248
- Google Books123
- MLA86
- RePEc55
- CiNii EN6
- CiNii JP4