Bakhtin, A. K., and I. V. Denega. “Inequalities for the Inner Radii of Nonorevlapping Domains”. Ukrains’kyi Matematychnyi Zhurnal 71, no. 7 (July 25, 2019): 996-1002. Accessed April 20, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/1492.