<https://www.zetatecnologia.com/2017/02/historia-del-logo-google-logotipo-google-traves-los-anos/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.zetatecnologia.com/2017/02/historia-del-logo-google-logotipo-google-traves-los-anos/>