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Data source
- METADATA.UB26,694
- Crossref23,555
- Web of Science (Lite)17,172
- Manual10,468
- OPENSCIENCE.UB9,380
- Europe PubMed Central7,154
- PubMed6,972
- arXiv5,170
- DBLP919
- Google Books667
- MLA219
- RePEc112
- CiNii EN12
- CiNii JP10