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Database
- Complementary Index19,769,999
- OpenAIRE12,810,577
- Gale General OneFile7,489,808
- Springer Nature Journals6,470,627
- Academic Search Index3,072,257
- OAIster3,043,163
- arXiv2,467,907
- Supplemental Index1,930,540
- eBook Index1,915,857