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Data source
- METADATA.UB26,694
- Crossref23,482
- Web of Science (Lite)17,116
- Manual10,444
- OPENSCIENCE.UB9,348
- Europe PubMed Central7,139
- PubMed6,961
- arXiv5,118
- DBLP915
- Google Books667
- MLA219
- RePEc112
- CiNii EN12
- CiNii JP10