<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef.bbci.co.uk/news/ws/560/amz/worldservice/live/assets/images/2012/11/23/121123085256_galicia_304x171_ap.jpg>
<http://www.bbc.com/mundo/noticias/2012/11/121115_cataluna_resto_espana_independencia_pea.shtml>