Gol’bergA. L., and Sevost’yanovE. A. 2015. “On the Radius of Injectivity for Generalized Quasiisometries in the Spaces of Dimension Higher Than Two”. Ukrains’kyi Matematychnyi Zhurnal 67 (2), 174-84. https://umj.imath.kiev.ua/index.php/umj/article/view/1972.