<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef.bbci.co.uk/news/ws/560/amz/worldservice/live/assets/images/2014/08/31/140831220819_sp_havana_airport_624x351_afp.jpg>
<http://www.bbc.com/mundo/ultimas_noticias/2014/08/140831_ultnot_restricciones_bienes_en_cuba_bd.shtml>