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- Complementary Index21,729,298
- OpenAIRE13,405,704
- Gale General OneFile7,568,748
- Springer Nature Journals7,394,087
- OAIster4,177,592
- Academic Search Index3,177,053
- arXiv2,622,328
- Supplemental Index2,122,348
- eBook Index2,009,323