<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef.bbci.co.uk/news/ws/560/amz/worldservice/live/assets/images/2014/04/16/140416160703_mobile_464x261_reuters.jpg>
<http://www.bbc.com/mundo/blogs/2014/04/140416_blog_un_mundo_feliz_sin_internet.shtml>