SGD

http://www.52ml.net/2024.html

 

http://blog.csdn.net/silence1214/article/details/22263969

http://fuliang.iteye.com/blog/1482002

http://blog.csdn.net/crcr/article/details/39481057

http://blog.csdn.net/pennyliang/article/details/6998517

http://www.cnblogs.com/tornadomeet/archive/2013/05/02/3053916.html

http://blog.csdn.net/silence1214/article/details/21520217

http://blog.csdn.net/zbc1090549839/article/details/38149561

http://www.cnblogs.com/alexanderkun/p/4023178.html