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Data source
- Web of Science (Lite)[remove]17,136
- Crossref16,253
- Europe PubMed Central6,610
- PubMed6,562
- METADATA.UB1,351
- Manual1,117
- OPENSCIENCE.UB888
- arXiv878
- DBLP382
- RePEc43
- MLA25
- CiNii EN8
- CiNii JP6
- Google Books5