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Database
- Complementary Index9,588,974
- OpenAIRE[remove]5,449,679
- Springer Nature Journals3,273,983
- Gale General OneFile3,037,779
- Academic Search Index1,793,016
- arXiv1,643,450
- OAIster1,470,021
- MEDLINE1,006,972
- Directory of Open Access Journals909,113