<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/2013/04/10/130410105457_thatcher_wave_304x171.jpg>
<http://www.bbc.com/mundo/ultimas_noticias/2013/04/130412_ultnot_bbc_transmitira_extracto_cancion_anti_thatcher.shtml>