Sevost’yanov , E. A. “Boundary Extension of Mappings That Satisfy the Poletsky Inverse Inequality in Terms of Prime Ends”. Ukrains’kyi Matematychnyi Zhurnal 73, no. 7 (July 20, 2021): 951 - 963. Accessed August 20, 2022. http://umj.imath.kiev.ua/index.php/umj/article/view/6507.