Gol’bergA. L. (1999) “Quasiconformal mappings and radii of normal systems of neighborhoods”, Ukrains’kyi Matematychnyi Zhurnal, 51(11), pp. 1566–1568. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/4758 (Accessed: 22November2024).