MarkishA. A., SalimovR. R., and Sevost’yanovE. A. “On the Lower Estimate of the Distortion of distance for One Class of Mappings”. Ukrains’kyi Matematychnyi Zhurnal 70, no. 11 (November 25, 2018): 1553-1562. Accessed December 22, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/1659.