Bely, V. I., and E. V. Kravchuk. “Explicit Relations for the Reduced Module and Harmonic Measure”. Ukrains’kyi Matematychnyi Zhurnal, vol. 45, no. 4, Apr. 1993, pp. 576–578, https://umj.imath.kiev.ua/index.php/umj/article/view/5844.