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