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Data source
- METADATA.UB26,694
- Crossref23,314
- Web of Science (Lite)17,016
- Manual10,351
- OPENSCIENCE.UB9,304
- Europe PubMed Central7,091
- PubMed6,920
- arXiv5,081
- DBLP912
- Google Books646
- MLA218
- RePEc112
- CiNii EN12
- CiNii JP10