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- Complementary Index20,953,861
- OpenAIRE13,420,074
- Gale General OneFile7,043,527
- Springer Nature Journals7,037,050
- OAIster3,809,540
- Academic Search Index3,058,173
- arXiv2,440,493
- Supplemental Index2,047,913
- eBook Index1,919,851