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Data source
- Crossref21,601
- Web of Science (Lite)17,087
- Manual10,408
- METADATA.UB7,248
- Europe PubMed Central7,128
- PubMed6,945
- arXiv5,145
- OPENSCIENCE.UB1,148
- DBLP918
- Google Books656
- MLA217
- RePEc112
- CiNii EN12
- CiNii JP10