British Broadcasting Corporation, November 14, 2011
http://www.bbc.co.uk/zhongwen/simp/chinese_news/2011/11/111114_aiweiwei_tax.shtml
Related news:
With Help, Chinese Artist Will Contest a Tax Bill
New York Times, November 11, 2011
http://www.nytimes.com/2011/11/12/world/asia/dissident-chinese-artist-ai-weiwei-will-contest-large-tax-bill.html