Hudaigulyev, B. A. “Elliptic Equation With Singular Potential”.
Ukrains’kyi Matematychnyi Zhurnal
62, no. 12 (December 25, 2010): 1715 – 1723. Accessed April 7, 2025.
https://umj.imath.kiev.ua/index.php/umj/article/view/2994
.