Publons
https://publons.com/about/home/
OpenAIRE
https://www.openaire.eu/
https://www.ugr.es/
http://educacion.ugr.es/
http://www.educacionyfp.gob.es/portada.html
http://www.juntadeandalucia.es/educacion/portals/web/ced
https://www.recursoscientificos.fecyt.es/
https://scholar.google.es/schhp?hl=es
Microsoft Academic
https://academic.microsoft.com/home
Bielefeld Academic Search Engine (BASE)
https://www.base-search.net/
Redalyc
http://www.redalyc.org/
ResearchGate
https://www.researchgate.net/
Academia.edu
https://www.academia.edu/
http://digibug.ugr.es/
https://hal.archives-ouvertes.fr/search/index
https://www.ssoar.info/ssoar/
https://www.ssoar.info/ssoar/
Social Science Research Network (SSRN)
https://www.ssrn.com/index.cfm/en/