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arXiv.orgAn e-print service in the fields of physics, mathematics, non-linear science, computer science, and quantitative biology
IEEEXploreProvides full-text access to IEEE transactions, IEEE and IET journals, magazines, and conference proceedings published since 1988, and all current IEEE standards.
zbMATH OpenFormerly Zentralblatt MATH. “The world’s most comprehensive and longest-running abstracting and reviewing service in pure and applied mathematics. It is edited by the European Mathematical Society (EMS), the Heidelberg Academy of Sciences and Humanities, and FIZ Karlsruhe.” Coverage complete from 1868 to the present.
