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Data source
- Crossref20,814
- Web of Science (Lite)15,907
- METADATA.UB10,727
- Europe PubMed Central6,967
- PubMed6,913
- Manual4,304
- OPENSCIENCE.UB2,973
- arXiv1,190
- DBLP353
- MLA94
- RePEc57
- CiNii EN12
- CiNii JP10
- Google Books2