...¹

http://ccrma.stanford.edu/~jos/mdft/Complex_Numbers.html

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...²

http://ccrma.stanford.edu/~jos/filters/State_Space_Models.html

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...³

In the field of computer graphics, the MCF has been called the ``magic circle'' algorithm, because it can be used to recursively draw ``circles'' on the screen that always close on themselves, even in low-precision arithmetic. While the drawing may look like a circle (when sufficiently many points are computed along its circumference), it is really an ellipse.

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... where⁴

http://ccrma.stanford.edu/~jos/waveguide/Digital_Waveguide_Oscillator.html

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