GoncharenkoS. V., and PoryadennayaV. I. “On Approximate Plotting of the Function Mapping a Circular Triply Connected Domain onto a Circle With Cuts ”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 23, no. 3, Apr. 1971, pp. 372-7, https://umj.imath.kiev.ua/index.php/umj/article/view/8565.