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http://www.pconline.com.cn/pcjob/process/other/others/0408/429815.html

http://geosoft.pku.edu.cn/blogs/skyswind/archive/2004/11/08/550.aspx

http://www.cnblogs.com/elevenwolf/archive/2004/12/01/71391.aspx

http://www.cnblogs.com/keyss/archive/2005/01/24/95707.html