<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef.bbci.co.uk/news/ws/560/amz/worldservice/live/assets/images/2014/03/29/140329005550_sp_putin_464x261_bbc_nocredit.jpg>
<http://www.bbc.com/mundo/noticias/2014/03/140328_putin_rusia_sovietica_wbm.shtml>