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Database
- Complementary Index19,792,909
- OpenAIRE12,810,577
- Gale General OneFile7,493,471
- Springer Nature Journals6,474,375
- Academic Search Index3,074,946
- OAIster3,043,163
- arXiv2,476,686
- Supplemental Index1,932,126
- eBook Index1,918,151