<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/2013/01/05/130105063415_sp_atun_304x171_ap.jpg>
<http://www.bbc.com/mundo/ultimas_noticias/2013/01/130105_ultnot_atun_subasta_ao.shtml>