<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/2013/10/02/131002173429_silk_road_website_304x171_bbc_nocredit.jpg>
<http://www.bbc.com/mundo/ultimas_noticias/2013/10/131002_ultnot_arresto_silk_road_vp.shtml>