Technical data for this type of fractal : click here.

For the factal here :
fn1 = ident(), fn2 = log(), fn3 = tanh(), fn4 = cotanh()
real(p1) = 4, imag(p1) = 2, real(p2) = 1, imag(p2) = 1, real(p3) = 1, imag(p3) = 1