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2020

1. Springer Link:
https://link.springer.com/

2. Nature
https://www.nature.com/siteindex/index.html

3. Springer Materials
http://materials.springer.com/

4. SpringerProtocols
http://www.springerprotocols.com/

5. zbMath
https://zbmath.org/

6.  Nano
https://goo.gl/PdhJdo