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Database
- OpenAIRE13,292,139
- Unpaywall10,835,813
- Complementary Index5,293,533
- Supplemental Index3,562,612
- Academic Search Index3,075,631
- OAIster2,374,946
- ScienceDirect1,260,778
- Springer Nature Journals879,541
- Gale General OneFile861,838