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Database
- Complementary Index19,799,687
- OpenAIRE12,810,577
- Gale General OneFile7,493,471
- Springer Nature Journals6,475,258
- Academic Search Index3,075,745
- OAIster3,043,163
- arXiv2,476,686
- Supplemental Index1,933,013
- eBook Index1,918,957