<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef.bbci.co.uk/news/ws/560/amz/worldservice/live/assets/images/2012/11/10/121110145838_cuba3_224x280_bbc_nocredit.jpg>
<http://www.bbcmundo.com/mundo/noticias/2012/11/121110_cuba_inversion_extranjera_rg.shtml>