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Data source
- Web of Science (Lite)[remove]17,094
- Crossref16,215
- Europe PubMed Central6,597
- PubMed6,550
- METADATA.UB1,350
- Manual1,117
- OPENSCIENCE.UB880
- arXiv878
- DBLP379
- RePEc43
- MLA25
- CiNii EN8
- CiNii JP6
- Google Books5