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- Complementary Index20,013,079
- OpenAIRE12,160,429
- Springer Nature Journals6,480,115
- IEEE Xplore Digital Library4,075,132
- OAIster3,481,958
- Business Source Ultimate2,710,064
- arXiv2,264,305
- Supplemental Index1,943,513
- eBook Index1,748,689