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http://my.oschina.net/oncereply/blog?catalog=41825

http://my.oschina.net/oncereply/blog/260755

http://www.ibm.com/developerworks/cn/linux/l-cn-python-optim/

http://blog.sina.com.cn/s/blog_9f48885501018ex8.html

http://ciniao.me/article.php?id=17

http://blog.csdn.net/liangliyin/article/details/5980505

http://www.oschina.net/question/129540_61768