A. K. Bakhtin, L. Vyhovs'ka, and I. V. Denega, “Inequalities for inner radii of symmetric disjoint domains”, Ukr. Mat. Zhurn., vol. 70, no. 9, pp. 1282–1288, Sep. 2018, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/1634