Fourier Analysis: An Introduction
Elias M. Stein, Rami Shakarchi
Fourier Analysis: An Introduction - A book resource
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mathworld.wolfram.com
MathWorld is Wolfram's comprehensive online encyclopedia of mathematics, featuring detailed, reference-style articles on a wide range of topics. It includes in-depth entries like Fourier series, with definitions, formulas, explanations, and bibliographic references.