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Data source
- Web of Science (Lite)[remove]17,044
- Crossref16,168
- Europe PubMed Central6,584
- PubMed6,539
- METADATA.UB1,350
- Manual1,113
- arXiv878
- OPENSCIENCE.UB876
- DBLP379
- RePEc43
- MLA25
- CiNii EN8
- CiNii JP6
- Google Books5