Горяйнов, В. В., & Ba, I. (1992). Semi–group of conformal mappings of the upper half–plane onto itself with the hydrodynamic normalization at infinity . Ukrains’kyi Matematychnyi Zhurnal, 44(10), 1320-1329. https://umj.imath.kiev.ua/index.php/umj/article/view/8227