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- Complementary Index22,077,562
- OpenAIRE13,405,704
- Springer Nature Journals7,504,642
- Gale General OneFile7,363,085
- OAIster4,443,728
- Academic Search Index3,219,380
- arXiv2,679,757
- Supplemental Index2,137,725
- eBook Index2,042,522