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Mathematics of the Discrete Fourier Transform (DFT) - Notes by Julius O. Smith III, Stanford.
Introduction to the Fourier Transform - Notes on applications to Image Processing.
An Introduction to Fourier Theory - A mathematically inclined introduction with illustrations and explanations of related theorems, its properties and numerical methods for calculating transforms.
Fast Fourier Transforms - Survey and history of FFT algorithms from Wikipedia.
Introduction To Fourier Transform - A description of the principle of fourier transform and subsequent derivation of formulae. Page includes graphs.
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