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Data source
- Crossref18,954
- Web of Science (Lite)15,881
- Europe PubMed Central6,954
- PubMed6,900
- Manual4,292
- METADATA.UB3,526
- arXiv1,188
- OPENSCIENCE.UB1,043
- DBLP354
- MLA94
- RePEc57
- CiNii EN12
- CiNii JP10
- Google Books2