PodvysotskiiR. V. “Estimation of the Product of Inner Radii of Partially Nonoverlapping Domains”. Ukrains’kyi Matematychnyi Zhurnal 60, no. 7 (July 25, 2008): 1004–1008. Accessed November 23, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/3218.