http://www.cnblogs.com/end/archive/2011/08/18/2144250.html
http://www.cnblogs.com/zzdfc/archive/2009/01/31/1381579.html
http://www.cnblogs.com/yangyancheng/archive/2011/05/17/2048794.html
http://www.cnblogs.com/eggTwo/p/3429352.html
http://www.cnblogs.com/eggTwo/p/3429366.html