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Data source
- Crossref21,088
- Web of Science (Lite)16,719
- Manual10,114
- Europe PubMed Central7,051
- PubMed6,878
- METADATA.UB6,781
- arXiv4,919
- OPENSCIENCE.UB1,133
- DBLP758
- Google Books644
- MLA205
- RePEc112
- CiNii EN12
- CiNii JP10