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Data source
- Crossref20,799
- Web of Science (Lite)15,903
- METADATA.UB10,727
- Europe PubMed Central6,964
- PubMed6,909
- Manual4,300
- OPENSCIENCE.UB2,970
- arXiv1,190
- DBLP353
- MLA94
- RePEc57
- CiNii EN12
- CiNii JP10
- Google Books2