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Database
- Complementary Index19,745,781
- OpenAIRE12,810,577
- Gale General OneFile7,477,051
- Springer Nature Journals[remove]6,463,734
- Academic Search Index3,069,372
- OAIster3,043,163
- arXiv2,463,379
- Supplemental Index1,928,917
- eBook Index1,908,813