wangzhi

http://blog.const.net.cn/a/9145.htm

http://blog.sina.com.cn/s/blog_bf5abc95010169jf.html

http://cissco.iteye.com/blog/410776

http://blog.chinaunix.net/uid-14880649-id-2954431.html

http://blog.jobbole.com/81265/