A. A. Markish, R. R. Salimov, and E. A. Sevost'yanov, “On the lower estimate of the distortion of distance for one class of mappings”, Ukr. Mat. Zhurn., vol. 70, no. 11, pp. 1553–1562, Nov. 2018, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/1659