<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef.bbci.co.uk/news/ws/560/amz/worldservice/live/assets/images/2013/02/22/130222121835_vietnam_stock_market_304x171_afp.jpg>
<http://www.bbc.com/vietnamese/business/2013/08/130823_vn_index_fall.shtml>