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Data source
- Crossref18,976
- Web of Science (Lite)15,896
- Europe PubMed Central6,958
- PubMed6,903
- Manual4,315
- METADATA.UB3,689
- arXiv1,188
- OPENSCIENCE.UB1,048
- DBLP355
- MLA94
- RePEc57
- CiNii EN12
- CiNii JP10
- Google Books2