Zabolotnii, Yaroslav, and Iryna Denega. “An Extremal Problem on Non-Overlapping Domains Containing Ellipse Points”. Eurasian Mathematical Journal 12, no. 4 (September 1, 2021): 82–91. Accessed November 19, 2024. https://emj.enu.kz/index.php/main/article/view/242.