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Data source
- Web of Science (Lite)[remove]16,718
- Crossref15,879
- Europe PubMed Central6,533
- PubMed6,489
- METADATA.UB1,285
- Manual1,069
- OPENSCIENCE.UB871
- arXiv852
- DBLP311
- RePEc43
- MLA24
- CiNii EN8
- CiNii JP6
- Google Books5