<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/2013/12/03/131203144719_carlos_finlay_624x351_google.jpg>
<http://www.bbc.com/mundo/noticias/2013/12/131203_salud_carlos_finlay_google_gtg.shtml>