Bakhtin, A. K., L.V. Vyhovs’ka, and I. V. Denega. “Inequalities for Inner Radii of Symmetric disjoint domains”. Ukrains’kyi Matematychnyi Zhurnal 70, no. 9 (September 25, 2018): 1282-1288. Accessed April 26, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/1634.