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arXiv is an e-print archive for physics, mathematics, computer science, and related disciplines.

BMC is an open access publisher for biology, health sciences, and medicine.

SpringerOpen is an open access publishing platform for researchers across science, technology, medicine, humanities, and social sciences to publish freely available work.

DOAJ is the best directory for open access journals and is used by researchers and institutions worldwide.

Europe PMC is the best resource for life sciences research articles and is used by researchers and institutions worldwide.