BayramovaN. Q., and GadjievT. S. “On Removable Sets for Degenerated Elliptic Equations”. Ukrains’kyi Matematychnyi Zhurnal 66, no. 8 (August 25, 2014): 1041–1057. Accessed November 23, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/2198.