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- OpenAIRE6,577,499
- Complementary Index6,530,724
- OAIster3,043,163
- arXiv2,472,321
- Gale General OneFile2,141,853
- Springer Nature Journals1,812,585
- Academic Search Index1,168,963
- Directory of Open Access Journals1,144,289
- Unpaywall559,768