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Data source
- METADATA.UB9,120
- Crossref3,984
- Web of Science (Lite)3,304
- Manual2,048
- OPENSCIENCE.UB1,657
- Europe PubMed Central1,265
- PubMed1,252
- arXiv1,059
- DBLP246
- Google Books125
- MLA86
- RePEc54
- CiNii EN6
- CiNii JP4