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Data source
- Web of Science (Lite)[remove]16,681
- Crossref15,842
- Europe PubMed Central6,517
- PubMed6,472
- METADATA.UB1,285
- Manual1,069
- OPENSCIENCE.UB865
- arXiv852
- DBLP309
- RePEc43
- MLA24
- CiNii EN8
- CiNii JP6
- Google Books5