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Data source
- METADATA.UB26,694
- Crossref23,454
- Web of Science (Lite)17,094
- Manual10,422
- OPENSCIENCE.UB9,330
- Europe PubMed Central7,129
- PubMed6,953
- arXiv5,117
- DBLP914
- Google Books658
- MLA219
- RePEc112
- CiNii EN12
- CiNii JP10