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Data source
- Crossref20,973
- Web of Science (Lite)16,640
- Manual10,038
- Europe PubMed Central7,023
- PubMed6,854
- METADATA.UB6,781
- arXiv4,865
- OPENSCIENCE.UB1,114
- DBLP753
- Google Books636
- MLA205
- RePEc112
- CiNii EN12
- CiNii JP10