<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/2013/05/29/130529092221_truong_duy_nhat_304x171_truongduynhat_nocredit.jpg>
<http://bbcvietnamese.com/vietnamese/vietnam/2013/05/130530_blog_que_choa_doi_dia_chi.shtml>