<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/2013/10/28/131028155150_putin_olimpicos_homosexuales_304x171_bbc.jpg>
<http://www.bbc.com/mundo/ultimas_noticias/2013/10/131028_ultnot_putin_invierno_olimpicos_amv.shtml>