<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef.bbci.co.uk/news/ws/560/amz/worldservice/live/assets/images/2012/11/27/121127020332_euro_greece_304x171_ap.jpg>
<http://www.bbc.com/mundo/ultimas_noticias/2012/12/121212_ultnot_grecia_compra_40_millones_de_deuda_ch.shtml>