http://www.tyut.edu.cn/kecheng1/2008/site04/courseware/chapter2/2-2-2-2.html
http://blog.youkuaiyun.com/techx/article/details/43830781
http://blog.youkuaiyun.com/u011240016/article/details/52623697
http://blog.youkuaiyun.com/andkobe/article/details/9534949