Technical data for this type of fractal : click here.

For the factal here :
fn1 = log(), fn2 = log(), fn3 = tanh(), fn4 = cos()
real(p1) = 4, imag(p1) = 8, real(p2) = 1, imag(p2) = 1, real(p3) = 16, imag(p3) = 1