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参考资料
1. http://www.cnblogs.com/nokiaguy/archive/2008/05/11/1191914.html
2. http://comic.sjtu.edu.cn/thucs/GD_jsj_025y/text/chapter01/sec05/default.htm
3. http://blog.csdn.net/sharpdew/archive/2006/05/25/755074.aspx
4. http://xiaomage.blog.51cto.com/293990/74094
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原文地址：http://www.cnblogs.com/psoame/p/5731571.html
