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Data source
- Crossref18,652
- Web of Science (Lite)15,605
- Europe PubMed Central6,883
- PubMed6,838
- Manual4,183
- METADATA.UB3,409
- arXiv1,149
- OPENSCIENCE.UB1,051
- DBLP310
- MLA88
- RePEc57
- CiNii EN12
- CiNii JP10
- Google Books2