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Data source
- Web of Science (Lite)[remove]17,085
- Crossref16,205
- Europe PubMed Central6,593
- PubMed6,546
- METADATA.UB1,346
- Manual1,115
- arXiv876
- OPENSCIENCE.UB867
- DBLP380
- RePEc43
- MLA25
- CiNii EN8
- CiNii JP6
- Google Books5