<https://secure.gravatar.com/avatar/9d386af205a6bc7235e0ee1229c791b2?s=96&amp;d=mm&amp;r=g>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://tfandroid.es/maximice-la-productividad-con-un-telefono-android/>