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Data source
- Crossref[remove]16,253
- Web of Science (Lite)[remove]16,253
- Europe PubMed Central6,504
- PubMed6,456
- METADATA.UB1,279
- Manual1,050
- OPENSCIENCE.UB887
- arXiv862
- DBLP353
- RePEc40
- MLA22
- CiNii EN8
- CiNii JP6
- Google Books2