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- OpenAIRE6,920,628
- Complementary Index6,806,096
- OAIster3,809,540
- arXiv2,463,379
- Gale General OneFile2,135,665
- Springer Nature Journals1,997,889
- Academic Search Index1,169,717
- Directory of Open Access Journals[remove]1,147,076
- Unpaywall698,888