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Data source
- CiNii EN12
- CiNii JP10
- Crossref21,635
- DBLP918
- Europe PubMed Central7,133
- Google Books656
- METADATA.UB7,248
- MLA217
- Manual10,441
- OPENSCIENCE.UB1,159
- PubMed6,955
- RePEc112
- Web of Science (Lite)17,123
- arXiv5,145