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Data source
- Crossref18,901
- Web of Science (Lite)15,855
- Europe PubMed Central6,936
- PubMed6,887
- Manual4,285
- METADATA.UB3,526
- arXiv1,188
- OPENSCIENCE.UB1,040
- DBLP353
- MLA94
- RePEc57
- CiNii EN12
- CiNii JP10
- Google Books2