<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/2013/12/09/131209144030_nguyen_dac_xuan_304x171_tinmoi.jpg>
<http://www.bbc.com/vietnamese/vietnam/2013/12/131209_vietnam_dan_phong_van_de.shtml>