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Data source
- Crossref20,999
- Web of Science (Lite)16,662
- Manual10,057
- Europe PubMed Central7,033
- PubMed6,860
- METADATA.UB6,781
- arXiv4,867
- OPENSCIENCE.UB1,117
- DBLP753
- Google Books644
- MLA205
- RePEc112
- CiNii EN12
- CiNii JP10