The Guardian, March 18, 2012
http://www.guardian.co.uk/world/2012/mar/18/china-beijing-social-revolution
中共权力斗争， 习近平强调保持“党的纯洁” (Xi Jinping Stresses Maintaining the "Purity of the Party" during Internal Power Struggle)
Radio Free Asia, March 17, 2012
http://www.rfa.org/mandarin/yataibaodao/jz-03172012021125.html
Related information:
领导干部要以身作则保持党的纯洁性 (Leading Cadres Must Set an Example to Maintain Purity of the Party)
Qiushi, March 16, 2012
http://news.qq.com/a/20120316/000250.htm