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Data source
- Web of Science (Lite)[remove]17,042
- Crossref16,166
- Europe PubMed Central6,580
- PubMed6,533
- METADATA.UB1,345
- Manual1,115
- arXiv876
- OPENSCIENCE.UB860
- DBLP379
- RePEc43
- MLA25
- CiNii EN8
- CiNii JP6
- Google Books5