Anisotropic Diffusion Filter - Source Code

Hi there! New to ITK, so it’s possible I’m missing something obvious, but I have been searching through the documentation for the GradientAnisotropicDiffusionFilter in Simple ITK and have found the descriptions of the anisotropic diffusion function ( and some code for the filter itself (, but I can’t seem to find the code where I can review the math being done. Could someone point me to it?

The math should be here:

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