<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/2012/10/21/121021144301_quoc_hoi_304x171_reuters_nocredit.jpg>
<http://bbcvietnamese.com/vietnamese/forum/2013/05/130531_quochoi_luatbieutinh.shtml>