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- OpenAIRE6,920,471
- Complementary Index[remove]6,798,908
- OAIster3,809,540
- arXiv2,463,379
- Gale General OneFile2,135,019
- Springer Nature Journals1,996,429
- Academic Search Index1,168,871
- Directory of Open Access Journals1,146,512
- Supplemental Index573,822