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Data source
- METADATA.UB26,694
- Crossref23,345
- Web of Science (Lite)17,044
- Manual10,362
- OPENSCIENCE.UB9,318
- Europe PubMed Central7,101
- PubMed6,937
- arXiv5,081
- DBLP912
- Google Books646
- MLA219
- RePEc112
- CiNii EN12
- CiNii JP10