N. Q. Bayramova and T. S. Gadjiev, “On Removable Sets for Degenerated Elliptic Equations”, Ukr. Mat. Zhurn., vol. 66, no. 8, pp. 1041–1057, Aug. 2014, Accessed: Apr. 13, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/2198