<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef.bbci.co.uk/news/ws/560/amz/worldservice/live/assets/images/2014/03/27/140327051744_sp_argentina_ypf_304x171_afp.jpg>
<http://www.bbc.com/mundo/ultimas_noticias/2014/04/140424_ultnot_argentina_repsol_ypf_diputados_ley_irm.shtml>