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Database
- Complementary Index[remove]21,090,555
- OpenAIRE13,420,073
- Gale General OneFile7,490,029
- Springer Nature Journals7,093,451
- OAIster3,809,540
- Academic Search Index3,080,937
- arXiv2,467,907
- Supplemental Index2,057,030
- eBook Index1,933,161