<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef.bbci.co.uk/news/ws/560/amz/worldservice/live/assets/images/2014/02/18/140218150106_miner_304x171_afp.jpg>
<http://www.bbc.com/mundo/noticias/2014/02/140218_sudafrica_mineros_ilegales_mz.shtml>