Sevost’yanov, E. A. “On Some Properties of Generalized Quasiisometries With Unbounded Characteristic”. Ukrains’kyi Matematychnyi Zhurnal 63, no. 3 (March 25, 2011): 385-398. Accessed April 26, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/2724.