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Data source
- Crossref[remove]16,192
- Web of Science (Lite)[remove]16,192
- Europe PubMed Central6,483
- PubMed6,436
- METADATA.UB1,278
- Manual1,050
- OPENSCIENCE.UB875
- arXiv862
- DBLP350
- RePEc40
- MLA22
- CiNii EN8
- CiNii JP6
- Google Books2