<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef-1.bbci.co.uk/news/ws/560/amz/worldservice/live/assets/images/2013/12/16/131216165745_juan_menendez_granados_464x261_coleccionjuanmenedezgranados.jpg>
<http://www.bbc.com/mundo/blogs/2013/12/131216_blog_polo_sur_buena_actitud.shtml>