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- Complementary Index21,124,495
- OpenAIRE13,420,073
- Gale General OneFile7,493,745
- Springer Nature Journals7,104,129
- OAIster3,809,540
- Academic Search Index3,085,511
- arXiv2,476,686
- Supplemental Index[remove]2,059,825
- eBook Index1,936,079