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- Complementary Index7,159,478
- OpenAIRE6,919,014
- OAIster4,177,592
- arXiv2,611,918
- Springer Nature Journals2,159,351
- Gale General OneFile2,150,004
- Academic Search Index1,220,454
- Directory of Open Access Journals1,137,604
- MEDLINE655,914