<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/2014/03/21/140321022846_terra_ziporyn_snider_624x351_arquivopessoal.jpg>
<http://www.bbc.com/portuguese/noticias/2014/03/140319_sono_alunos_ac_lk.shtml?postId=119012200>