■ Zentralblatt MATH (zbMATH) 
Zentralblatt MATH is a complete and long-running abstracting and reviewing service in pure and applied mathematics.
The Zentralblatt MATH Database contains more than 3 million entries drawn from more than 3500 serials and journals and covers the period from 1826 to today.
The entries are classified according to the Mathematics Subject Classification Scheme (MSC).

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https://zbmath.org/