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Data source
- Crossref20,872
- Web of Science (Lite)16,592
- Manual9,981
- Europe PubMed Central7,000
- PubMed6,838
- METADATA.UB6,781
- arXiv4,829
- OPENSCIENCE.UB1,110
- DBLP751
- Google Books625
- MLA205
- RePEc112
- CiNii EN12
- CiNii JP10