1、http://www.cnblogs.com/xing901022/p/3975626.html

2、http://www.cnblogs.com/xing901022/p/3978987.html

3、http://www.cnblogs.com/gaoyoubo/articles/1899815.html

4、http://www.cnblogs.com/fickleness/p/3151997.html

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