http://cecs.wright.edu/people/faculty/tkprasad/courses/cs781/alephOne.html
http://www.cnblogs.com/zkzkzkzkzk/p/4450398.html
http://blog.csdn.net/sealyao/article/details/5993938
http://blog.csdn.net/dlutbrucezhang/article/details/8652013
http://blog.csdn.net/feier7501/article/details/8531803
http://blog.chinaunix.net/uid-24347760-id-1989555.html