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Data source
- METADATA.UB26,694
- Crossref23,469
- Web of Science (Lite)17,098
- Manual10,438
- OPENSCIENCE.UB9,338
- Europe PubMed Central7,133
- PubMed6,954
- arXiv5,118
- DBLP914
- Google Books666
- MLA219
- RePEc112
- CiNii EN12
- CiNii JP10