傅里叶变换
http://vdisk.weibo.com/s/aW42jaPITUNHa
http://www.docin.com/p-657665236.html
https://www.zhihu.com/question/22202980/answer/20973635
http://blog.csdn.net/baimafujinji/article/details/10931621
正态分布
https://cos.name/2013/01/story-of-normal-distribution-1/
复变函数与积分变换
https://wenku.baidu.com/view/3cc3cfc2aef8941ea66e0505.html
协方差矩阵
http://www.cnblogs.com/nsnow/p/4758202.html
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