Yang, Jianfu, and Xiaohui Yu. “Fractional Hardy-Sobolev Elliptic Problems”. Topological Methods in Nonlinear Analysis 55, no. 1 (March 4, 2020): 257–280. Accessed July 5, 2025. https://apcz.umk.pl/TMNA/article/view/TMNA.2019.075.