B. A. Klishchuk and R. R. Salimov, “Lower bounds for the volume of the image of a ball”, Ukr. Mat. Zhurn., vol. 71, no. 6, pp. 774–785, Jun. 2019, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/1475