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- Complementary Index21,046,772
- OpenAIRE13,420,073
- Gale General OneFile7,434,722
- Springer Nature Journals7,077,830
- OAIster3,809,540
- Academic Search Index3,074,072
- arXiv2,463,379
- Supplemental Index2,054,240
- eBook Index1,925,926