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- OpenAIRE6,923,002
- Complementary Index6,791,711
- OAIster3,809,540
- arXiv2,458,791
- Gale General OneFile2,086,334
- Springer Nature Journals1,992,615
- Academic Search Index1,167,624
- Directory of Open Access Journals1,142,010
- Unpaywall698,888