<https://secure.gravatar.com/avatar/cf31b00f535fbbabc6861ab8b675f559?s=96&amp;d=blank&amp;r=g>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.gestion.org/que-son-y-como-evitar-los-gastos-hormiga/>