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Fast Fourier Transform
Article in MathWorld. (infos)Mathematics of the Discrete Fourier Transform (DFT)
Notes by Julius O. Smith III, Stanford. (infos)
Introduction to the Fourier Transform
Notes on applications to Image Processing. (infos)
Fast Fourier Transforms
Survey and history of FFT algorithms from Wikipedia. (infos)
An Introduction to Fourier Theory
A mathematically inclined introduction with illustrations and explanations of related theorems, its properties and numerical methods for calculating transforms. (infos)