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Database
- Complementary Index19,755,996
- OpenAIRE12,810,577
- Gale General OneFile7,479,428
- Springer Nature Journals6,465,178
- Academic Search Index3,069,858
- OAIster3,043,163
- arXiv2,463,379
- Supplemental Index1,929,613
- eBook Index1,908,823