I want some papers or blogs about the principles of "FFT" which used in "https://github.com/zkcrypto/bellman/blob/3c44bfe15358ae686f9e3780aaa4cbef8ec4a472/src/domain.rs#L316-L372 ".

[huapengcheng]

I want some papers or blogs about the principles of "FFT" which used in"/bellman/src/demain.rs/parallel_ff()#316-372".