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- Complementary Index21,084,796
- OpenAIRE13,420,073
- Gale General OneFile7,480,414
- Springer Nature Journals7,087,876
- OAIster3,809,540
- Academic Search Index3,078,761
- arXiv2,467,907
- Supplemental Index2,056,774
- eBook Index1,913,235