SalimovR. R., and SmolovayaE. S. “On the Order of Growth of Ring $Q$-Homeomorphisms at Infinity”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 62, no. 6, June 2010, pp. 829 -, https://umj.imath.kiev.ua/index.php/umj/article/view/2913.