<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef.bbci.co.uk/news/ws/560/amz/worldservice/live/assets/images/2011/08/05/110805152207_nguyen_quang_lap_304x171_nguyenquanglapblog_nocredit.jpg>
<http://bbcvietnamese.com/vietnamese/vietnam/2013/05/130530_blog_que_choa_doi_dia_chi.shtml>