Горяйнов, В. В., and I. Ba. “Semi–group of Conformal Mappings of the Upper half–plane onto Itself With the Hydrodynamic Normalization at Infinity ”. Ukrains’kyi Matematychnyi Zhurnal 44, no. 10 (October 1, 1992): 1320–1329. Accessed April 7, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/8227.