Fuentes de Datos

 Colegas, no se si los conocen, pero estos son muy buenos sitios para encontrar articulos cientificos... 

1. https://www.tandfonline.com

2. https://scholar.google.com/

3. https://www.researchgate.net/

4. https://academic.microsoft.com/home

5. https://www.base-search.net/

6. https://core.ac.uk/

7. http://science.gov/

8. https://www.semanticscholar.org/

9. https://xueshu.baidu.com/

10. http://citeseerx.ist.psu.edu/

11. http://www.bioline.org.br/

12. http://www.doaj.org/

13. http://www.plosone.org/

14. https://bioone.org/

15. http://iopscience.iop.org/1468-6996/

17. https://www.sciencedirect.com/

18. https://www.academia.edu/

19. https://www.pdfdrive.com/

20. https://www.proquest.com/

Y estos son los mejores sitios para bajar articulos gratuitos

** sci-hub.tw

Booksc.org

https://libgen.nl/

https://www.freefullpdf.com/#gsc.tab=0

https://cyberleninka.org/

https://hal.archives-ouvertes.fr/

https://openaccessbutton.org/

https://onlinelibrary.wiley.com/

https://link.springer.com/

https://www.scienceopen.com/

https://core.ac.uk/