1. Trade competition and environmental regulations: domestic political constraints and issue visibility;Cao;J. Polit.,2012
2. China Economy Net. 2006. Available from: http://www.ce.cn/xwzx/gnsz/gdxw/200609/18/t20060918_8601465.shtml (accessed 21.03.14.).
3. China Environment Net. 2007. Available from: http://www.chinaenvironment.com/view/viewnews.aspx?k=20070124115341093 (accessed 19.03.14.).
4. China News Net. 2006. Available from: http://www.chinanews.com/news/2006/2006-01-07/8/675054.shtml (accessed 20.03.14.).
5. China News Net. 2009. Available from: http://www.chinanews.com/gn/news/2009/02-26/1579078.shtml (accessed 22.03.14.).