<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://www.bbc.com/mundo/ultimas_noticias/2013/03/130325_ultnot_chile_minero_atrapado_ap.shtml>
<http://www.bbc.com/mundo/ultimas_noticias/2013/03/130325_ultnot_chile_minero_atrapado_ap.shtml>