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Data source
- Crossref21,028
- Web of Science (Lite)16,665
- Manual10,057
- Europe PubMed Central7,043
- PubMed6,865
- METADATA.UB6,781
- arXiv4,875
- OPENSCIENCE.UB1,117
- DBLP754
- Google Books644
- MLA205
- RePEc112
- CiNii EN12
- CiNii JP10