Technical data for this type of fractal : click here.
For the factal here (a zoom on a small part of the previous fractal) :
fn1 = log(), fn2 = log(), fn3 = flip(), fn4 = cos()
real(p1) = 6, imag(p1) = 8, real(p2) = -16, imag(p2) = 1, real(p3) = 20, imag(p3) = 0
Note.
The flip function swaps the real and imaginery components
of the complex number, e.g. (4,5) becomes (5,4).